Loans (Loans Individually Evaluated For Impairment By Class Of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	$ 259,827	$ 290,908
Recorded investment	142,362	187,135	192,464
Allowance for loan losses allocated	7,579	15,935
Commercial, Financial And Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	22,103		24,925
Commercial, Financial And Agricultural [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	36,774	23,164
Recorded investment	14,739	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	11,333	23,719
Recorded investment	7,364	22,523
Allowance for loan losses allocated	2,005	5,819
Construction Real Estate - Vision/SEPH Commercial Land And Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	13,261		42,036
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	57,629	54,032
Recorded investment	13,261	17,786
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		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	27,418		33,961
Construction Real Estate - Remaining Commercial [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	32,831	33,319
Recorded investment	18,597	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	9,193	9,711
Recorded investment	8,821	7,540
Allowance for loan losses allocated	3,334	1,874
Residential Real Estate - Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	36,583		47,422
Residential Real Estate - Commercial [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	42,535	49,341
Recorded investment	32,495	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	5,254	6,402
Recorded investment	4,088	5,590
Allowance for loan losses allocated	1,106	2,271
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	42,978		44,099
Commercial Real Estate [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	57,045	58,242
Recorded investment	36,215	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	7,214	12,183
Recorded investment	6,763	10,472
Allowance for loan losses allocated	1,134	4,431
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	19		21
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