Loans (Loans Individually Evaluated For Impairment By Class Of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	$ 276,754	$ 290,908
Recorded investment	169,690	187,135	200,400
Allowance for loan losses allocated	10,946	15,935
Commercial, Financial And Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	41,591		24,008
Commercial, Financial And Agricultural [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	36,340	23,164
Recorded investment	27,776	18,098
Allowance for loan losses allocated
Commercial, Financial And Agricultural [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	17,685	23,719
Recorded investment	13,815	22,523
Allowance for loan losses allocated	4,793	5,819
Construction Real Estate - Vision/SEPH LLC Commercial Land And Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	17,272		46,847
Construction Real Estate - Vision/SEPH LLC Commercial Land And Development [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	63,422	54,032
Recorded investment	17,272	17,786
Allowance for loan losses allocated
Construction Real Estate - Vision/SEPH 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	29,562		33,685
Construction Real Estate - Remaining Commercial [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	32,923	33,319
Recorded investment	18,926	18,372
Allowance for loan losses allocated
Construction Real Estate - Remaining Commercial [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	11,212	9,711
Recorded investment	10,636	7,540
Allowance for loan losses allocated	3,926	1,874
Residential Real Estate - Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	37,277		48,594
Residential Real Estate - Commercial [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	43,612	49,341
Recorded investment	33,357	38,686
Allowance for loan losses allocated
Residential Real Estate - Commercial [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	5,072	6,402
Recorded investment	3,920	5,590
Allowance for loan losses allocated	873	2,271
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	43,969		47,243
Commercial Real Estate [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	57,055	58,242
Recorded investment	36,255	41,506
Allowance for loan losses allocated
Commercial Real Estate [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	9,414	12,183
Recorded investment	7,714	10,472
Allowance for loan losses allocated	1,354	4,431
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	19		23
Consumer [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	19	20
Recorded investment	19	20
Allowance for loan losses allocated
Consumer [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance
Recorded investment
Allowance for loan losses allocated