Loans And Allowance For Loan Losses (Loan Portfolio Credit Exposure) (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 20,086,660,000	[1]	$ 19,562,063,000	[2]
Nonaccrual substandard loans	384,000,000		518,100,000
Deferred fees and costs, net	28,862,000		20,373,000		12,000,000
Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,587,541,000		1,542,397,000
Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,519,068,000		1,411,561,000
Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	256,846,000		263,561,000
Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	284,778,000		277,229,000
Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,566,679,000		4,416,481,000
1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,163,253,000		1,286,042,000
Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	707,820,000		795,341,000
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,437,752,000		6,497,864,000
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,000,675,000		9,569,451,000
Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,498,739,000		5,291,078,000
Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,814,720,000		3,762,024,000
Small Business [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	687,216,000		516,349,000
Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,648,233,000		3,494,748,000
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	18,277,301,000		16,969,176,000
Pass [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,559,272,000		1,511,729,000
Pass [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,475,928,000		1,371,659,000
Pass [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	255,339,000		260,194,000
Pass [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	281,179,000		272,917,000
Pass [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,150,790,000		3,699,465,000
Pass [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	898,409,000		910,149,000
Pass [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	424,444,000		417,935,000
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,473,643,000		5,027,549,000
Pass [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	9,231,940,000		8,525,128,000
Pass [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,062,333,000		4,719,417,000
Pass [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,495,407,000		3,301,220,000
Pass [Member] | Small Business [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	674,200,000		504,491,000
Pass [Member] | Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,571,718,000		3,416,499,000
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	850,638,000		1,376,956,000
Special Mention [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0		0
Special Mention [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0		0
Special Mention [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0		0
Special Mention [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0		0
Special Mention [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	249,890,000		463,532,000
Special Mention [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	126,715,000		197,149,000
Special Mention [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	94,316,000		143,684,000
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	470,921,000		804,365,000
Special Mention [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	379,717,000		572,591,000
Special Mention [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	224,620,000		311,475,000
Special Mention [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	155,097,000		261,116,000
Special Mention [Member] | Small Business [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0		0
Special Mention [Member] | Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0		0
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	926,405,000		1,190,719,000
Substandard [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	24,931,000		29,094,000
Substandard [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	40,935,000		39,321,000
Substandard [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	541,000		1,776,000
Substandard [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,400,000		4,093,000
Substandard [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	164,275,000		253,484,000
Substandard [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	129,775,000		176,672,000
Substandard [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	186,513,000		227,761,000
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	480,563,000		657,917,000
Substandard [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	376,035,000		458,518,000
Substandard [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	201,410,000		249,122,000
Substandard [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	162,406,000		198,833,000
Substandard [Member] | Small Business [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	12,219,000		10,563,000
Substandard [Member] | Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	69,807,000		74,284,000
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	24,429,000		19,733,000
Doubtful [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0		0
Doubtful [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0		0
Doubtful [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0		0
Doubtful [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0		0
Doubtful [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,724,000		0
Doubtful [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,062,000		1,953,000
Doubtful [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,547,000		5,961,000
Doubtful [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	12,333,000		7,914,000
Doubtful [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	12,096,000		11,819,000
Doubtful [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	10,286,000		10,964,000
Doubtful [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,810,000		855,000
Doubtful [Member] | Small Business [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0		0
Doubtful [Member] | Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0		0
Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,887,000		5,479,000
Loss [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,338,000		1,574,000
Loss [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,205,000		581,000
Loss [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	966,000		1,591,000
Loss [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	199,000		219,000
Loss [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0		0
Loss [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	292,000		119,000
Loss [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0		0
Loss [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	292,000		119,000
Loss [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	887,000		1,395,000
Loss [Member] | Commercial, Financial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	90,000		100,000
Loss [Member] | Owner-Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0		0
Loss [Member] | Small Business [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	797,000		1,295,000
Loss [Member] | Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 6,708,000		$ 3,965,000

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

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