Loans (Composition Of Loan Portfolio, By Class Of Loan) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2011		Dec. 31, 2010
Financing Receivable, Recorded Investment [Line Items]
Loan balance	$ 4,710,513		$ 4,732,685
Accrued interest receivable	15,514		17,505
Recorded investment	4,726,027		4,750,190
Commercial, Financial And Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance	755,793	[1]	737,902	[1]
Accrued interest receivable	2,626	[1]	2,886	[1]
Recorded investment	758,419	[1]	740,788	[1]
Construction Real Estate - Vision Commercial Land And Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance	111,054	[1]	171,334	[1]
Accrued interest receivable	235	[1]	282	[1]
Recorded investment	111,289	[1]	171,616	[1]
Construction Real Estate - Remaining Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance	181,422		195,693
Accrued interest receivable	453		622
Recorded investment	181,875		196,315
Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance	21,367		26,326
Accrued interest receivable	69		95
Recorded investment	21,436		26,421
Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance	16,489		13,127
Accrued interest receivable	74		54
Recorded investment	16,563		13,181
Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance	454,864		464,903
Accrued interest receivable	1,353		1,403
Recorded investment	456,217		466,306
Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance	950,782		906,648
Accrued interest receivable	1,771		2,789
Recorded investment	952,553		909,437
Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance	254,860		260,463
Accrued interest receivable	967		1,014
Recorded investment	255,827		261,477
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance	53,062		60,195
Accrued interest receivable	219		255
Recorded investment	53,281		60,450
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance	1,257,292	[1]	1,226,616	[1]
Accrued interest receivable	4,775	[1]	4,804	[1]
Recorded investment	1,262,067	[1]	1,231,420	[1]
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance	651,250		666,871
Accrued interest receivable	2,938		3,245
Recorded investment	654,188		670,116
Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance	2,278		2,607
Accrued interest receivable	34		56
Recorded investment	$ 2,312		$ 2,663

[1] Included within commercial, financial and agricultural loans, commercial real estate loans, and Vision commercial land and development loans are an immaterial amount of consumer loans that are not broken out by class.