Loans (Loans Individually Evaluated For Impairment By Class Of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	$ 201,575	$ 242,345
Recorded investment	118,251	137,339	142,362
Allowance for loan losses allocated	9,297	8,276
Commercial Financial And Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	19,871		22,103
Commercial Financial And Agricultural [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	25,979	23,782
Recorded investment	15,556	14,683
Allowance for loan losses allocated	0	0
Commercial Financial And Agricultural [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	8,602	12,268
Recorded investment	4,315	7,904
Allowance for loan losses allocated	1,728	3,180
Construction Real Estate - SEPH Commercial Land And Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	6,489		13,261
Construction Real Estate - SEPH Commercial Land And Development [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	31,362	56,075
Recorded investment	6,489	12,740
Allowance for loan losses allocated	0	0
Construction Real Estate - SEPH Commercial Land And Development [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	0	1,271
Recorded investment	0	520
Allowance for loan losses allocated	0	0
Construction Real Estate - Remaining Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	15,606		27,418
Construction Real Estate - Remaining Commercial [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	25,349	29,328
Recorded investment	11,380	14,093
Allowance for loan losses allocated	0	0
Construction Real Estate - Remaining Commercial [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	4,267	8,071
Recorded investment	4,226	7,481
Allowance for loan losses allocated	1,221	2,277
Residential Real Estate - Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	34,477		36,583
Residential Real Estate - Commercial [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	38,888	39,918
Recorded investment	32,356	31,957
Allowance for loan losses allocated	0	0
Residential Real Estate - Commercial [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	2,471	3,944
Recorded investment	2,121	3,665
Allowance for loan losses allocated	442	1,279
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	41,009		42,978
Commercial Real Estate [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	56,433	56,258
Recorded investment	33,657	35,097
Allowance for loan losses allocated	0	0
Commercial Real Estate [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	7,425	11,412
Recorded investment	7,352	9,181
Allowance for loan losses allocated	5,906	1,540
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	799		19
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	0	0
Consumer [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	0	0
Recorded investment	0	0
Allowance for loan losses allocated	$ 0	$ 0