Loans (Loans Individually Evaluated For Impairment By Class Of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	$ 233,143	$ 242,345
Recorded investment	130,303	137,339	179,424
Allowance for loan losses allocated	8,260	8,276
Commercial, Financial And Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	21,742		40,241
Commercial, Financial And Agricultural [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	22,392	23,782
Recorded investment	13,403	14,683
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	12,924	12,268
Recorded investment	8,339	7,904
Allowance for loan losses allocated	3,519	3,180
Construction Real Estate - Vision/SEPH Commercial Land And Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	10,482		19,433
Construction Real Estate - Vision/SEPH Commercial Land And Development [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	53,287	56,075
Recorded investment	10,482	12,740
Allowance for loan losses allocated
Construction Real Estate - Vision/SEPH Commercial Land And Development [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance		1,271
Recorded investment		520
Allowance for loan losses allocated
Construction Real Estate - Remaining Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	20,483		32,673
Construction Real Estate - Remaining Commercial [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	24,614	29,328
Recorded investment	11,209	14,093
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	9,984	8,071
Recorded investment	9,274	7,481
Allowance for loan losses allocated	2,939	2,277
Residential Real Estate - Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	36,722		43,752
Residential Real Estate - Commercial [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	40,341	39,918
Recorded investment	32,566	31,957
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	4,498	3,944
Recorded investment	4,156	3,665
Allowance for loan losses allocated	1,154	1,279
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	40,075		43,305
Commercial Real Estate [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	58,637	56,258
Recorded investment	34,750	35,097
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	5,667	11,412
Recorded investment	5,325	9,181
Allowance for loan losses allocated	648	1,540
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	799		20
Consumer [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	799	18
Recorded investment	799	18
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