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

[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.