Loans (Loans Individually Evaluated For Impairment By Class Of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	$ 290,458	$ 290,908
Recorded investment	179,424	187,135	238,959
Allowance for loan losses allocated	9,505	15,935
Commercial, Financial And Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	40,241		19,391
Commercial, Financial And Agricultural [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	33,769	23,164
Recorded investment	26,956	18,098
Commercial, Financial And Agricultural [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	14,597	23,719
Recorded investment	13,285	22,523
Allowance for loan losses allocated	4,704	5,819
Construction Real Estate - Vision/SE LLC Commercial Land And Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	19,433		82,060
Construction Real Estate - Vision/SE LLC Commercial Land And Development [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	68,297	54,032
Recorded investment	19,433	17,786
Construction Real Estate - Vision/SE LLC Commercial Land And Development [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance		20,775
Recorded investment		6,542
Allowance for loan losses allocated		1,540
Construction Real Estate - Remaining Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	32,673		26,126
Construction Real Estate - Remaining Commercial [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	28,851	33,319
Recorded investment	24,604	18,372
Construction Real Estate - Remaining Commercial [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	20,927	9,711
Recorded investment	8,069	7,540
Allowance for loan losses allocated	2,096	1,874
Residential Real Estate - Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	43,752		58,123
Residential Real Estate - Commercial [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	52,550	49,341
Recorded investment	39,483	38,686
Residential Real Estate - Commercial [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	5,642	6,402
Recorded investment	4,269	5,590
Allowance for loan losses allocated	1,199	2,271
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	43,305		53,259
Commercial Real Estate [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	55,974	58,242
Recorded investment	35,236	41,506
Commercial Real Estate [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	9,831	12,183
Recorded investment	8,069	10,472
Allowance for loan losses allocated	1,506	4,431
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	20
Consumer [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	20	20
Recorded investment	$ 20	$ 20