Loans (Aging Of Recorded Investment In Past Due Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013 contracts		Sep. 30, 2012 contracts	Sep. 30, 2013 contracts		Sep. 30, 2012 contracts	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	112		731	373		805
Accruing loans past due 30-89 days	$ 28,451			$ 28,451			$ 40,325
Past due nonaccrual loans and loans past due 90 days or more and accruing	61,561	[1]		61,561	[1]		82,514	[2]
Total loans past due	90,012			90,012			122,839
Total current	4,497,283			4,497,283			4,341,070
Recorded Investment	4,587,295			4,587,295			4,463,909
Loans past due 90 days or more and accruing	1,696			1,696			3,030
Financing Receivable, Modifications, Recorded Investment, During Period	10,532		12,824	18,101		35,210
Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	7		12	21		28
Accruing loans past due 30-89 days	3,004			3,004			6,251
Past due nonaccrual loans and loans past due 90 days or more and accruing	13,424	[1]		13,424	[1]		11,811	[2]
Total loans past due	16,428			16,428			18,062
Total current	793,672			793,672			808,841
Loans past due 90 days or more and accruing	0			0			37
Financing Receivable, Modifications, Recorded Investment, During Period	3,484		539	3,865		4,105
Construction Real Estate - SEPH Commercial Land And Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	0			0			686
Past due nonaccrual loans and loans past due 90 days or more and accruing	5,540	[1]		5,540	[1]		11,314	[2]
Total loans past due	5,540			5,540			12,000
Total current	2,085			2,085			3,142
Recorded Investment	7,625	[3]		7,625	[3]		15,142	[3]
Loans past due 90 days or more and accruing	0			0			0
Construction Real Estate - Remaining Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	0		3	2		13
Accruing loans past due 30-89 days	396			396			3,652
Past due nonaccrual loans and loans past due 90 days or more and accruing	4,463	[1]		4,463	[1]		5,838	[2]
Total loans past due	4,859			4,859			9,490
Total current	99,263			99,263			106,314
Recorded Investment	104,122			104,122			115,804
Loans past due 90 days or more and accruing	0			0			0
Financing Receivable, Modifications, Recorded Investment, During Period			369	403		10,256
Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	0		2	0		2
Accruing loans past due 30-89 days	234			234			171
Past due nonaccrual loans and loans past due 90 days or more and accruing	75	[1]		75	[1]		85	[2]
Total loans past due	309			309			256
Total current	27,284			27,284			26,198
Recorded Investment	27,593			27,593			26,454
Loans past due 90 days or more and accruing	0			0			0
Financing Receivable, Modifications, Recorded Investment, During Period			186			186
Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	1		6	3		6
Accruing loans past due 30-89 days	99			99			135
Past due nonaccrual loans and loans past due 90 days or more and accruing	15	[1]		15	[1]		40	[2]
Total loans past due	114			114			175
Total current	7,335			7,335			8,435
Recorded Investment	7,449			7,449			8,610
Loans past due 90 days or more and accruing	0			0			0
Financing Receivable, Modifications, Recorded Investment, During Period	15		274	39		274
Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	0		5	14		10
Accruing loans past due 30-89 days	339			339			1,163
Past due nonaccrual loans and loans past due 90 days or more and accruing	4,675	[1]		4,675	[1]		5,917	[2]
Total loans past due	5,014			5,014			7,080
Total current	397,787			397,787			386,082
Recorded Investment	402,801			402,801			393,162
Loans past due 90 days or more and accruing	0			0			94
Financing Receivable, Modifications, Recorded Investment, During Period			610	2,574		871
Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	8		82	41		97
Accruing loans past due 30-89 days	12,750			12,750			11,948
Past due nonaccrual loans and loans past due 90 days or more and accruing	11,817	[1]		11,817	[1]		17,370	[2]
Total loans past due	24,567			24,567			29,318
Total current	1,112,854			1,112,854			1,036,868
Recorded Investment	1,137,421			1,137,421			1,066,186
Loans past due 90 days or more and accruing	711			711			950
Financing Receivable, Modifications, Recorded Investment, During Period	513		5,780	3,129		8,367
Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	6		43	13		43
Accruing loans past due 30-89 days	636			636			620
Past due nonaccrual loans and loans past due 90 days or more and accruing	501	[1]		501	[1]		309	[2]
Total loans past due	1,137			1,137			929
Total current	211,968			211,968			212,868
Recorded Investment	213,105			213,105			213,797
Loans past due 90 days or more and accruing	0			0			0
Financing Receivable, Modifications, Recorded Investment, During Period	129		861	222		861
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	429			429			563
Past due nonaccrual loans and loans past due 90 days or more and accruing	239	[1]		239	[1]		787	[2]
Total loans past due	668			668			1,350
Total current	35,600			35,600			42,576
Recorded Investment	36,268			36,268			43,926
Loans past due 90 days or more and accruing	3			3			54
Financing Receivable, Modifications, Recorded Investment, During Period	93		946	193		1,115
SEPH Commercial Land and Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	0		2	0		6
Financing Receivable, Modifications, Recorded Investment, During Period			60			887
Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment	810,100	[3]		810,100	[3]		826,903	[3]
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	9		2	16		22
Accruing loans past due 30-89 days	421			421			2,212
Past due nonaccrual loans and loans past due 90 days or more and accruing	16,980	[1]		16,980	[1]		26,355	[2]
Total loans past due	17,401			17,401			28,567
Total current	1,101,713			1,101,713			1,067,436
Recorded Investment	1,119,114	[3]		1,119,114	[3]		1,096,003	[3]
Loans past due 90 days or more and accruing	204			204			1,007
Financing Receivable, Modifications, Recorded Investment, During Period	5,671		257	6,635		5,255
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	76		526	251		527
Accruing loans past due 30-89 days	10,143			10,143			12,924
Past due nonaccrual loans and loans past due 90 days or more and accruing	3,832	[1]		3,832	[1]		2,688	[2]
Total loans past due	13,975			13,975			15,612
Total current	704,352			704,352			639,153
Recorded Investment	718,327			718,327			654,765
Loans past due 90 days or more and accruing	778			778			888
Financing Receivable, Modifications, Recorded Investment, During Period	627		2,942	1,041		3,033
Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	0			0			0
Past due nonaccrual loans and loans past due 90 days or more and accruing	0	[1]		0	[1]		0	[2]
Total loans past due	0			0			0
Total current	3,370			3,370			3,157
Recorded Investment	3,370			3,370			3,157
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	5		48	12		51
Accruing Financing Receivable Modifications [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	3,541		7,619	5,838		15,528
Accruing Financing Receivable Modifications [Member] | Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	2,806		121	2,813		2,195
Accruing Financing Receivable Modifications [Member] | Construction Real Estate - Remaining Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period				403		3,695
Accruing Financing Receivable Modifications [Member] | Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	0		101	0		101
Accruing Financing Receivable Modifications [Member] | Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	15		177	15		177
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	120		3,780	1,513		4,006
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	129		718	222		718
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	52		675	118		675
Accruing Financing Receivable Modifications [Member] | SEPH Commercial Land and Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period
Accruing Financing Receivable Modifications [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period						1,823
Accruing Financing Receivable Modifications [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	419		2,047	754		2,138
Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	6,991		5,205	12,263		19,682
Nonaccruing Financing Receivable Modifications [Member] | Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	678		418	1,052		1,910
Nonaccruing Financing Receivable Modifications [Member] | Construction Real Estate - Remaining Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period			369			6,561
Nonaccruing Financing Receivable Modifications [Member] | Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period			85			85
Nonaccruing Financing Receivable Modifications [Member] | Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period			97	24		97
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period			610	2,574		871
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	393		2,000	1,616		4,361
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	0		143	0		143
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	41		271	75		440
Nonaccruing Financing Receivable Modifications [Member] | SEPH Commercial Land and Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period			60			887
Nonaccruing Financing Receivable Modifications [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	5,671		257	6,635		3,432
Nonaccruing Financing Receivable Modifications [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	$ 208		$ 895	$ 287		$ 895

[1] Includes $1.7 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans and accruing troubled debt restructurings. December 31, 2012(in thousands)Accruing loanspast due 30-89days Past duenonaccrual loans and loans pastdue 90 days ormore andaccruing* Total past due Total current Total recordedinvestmentCommercial, financial and agricultural$6,251 $11,811 $18,062 $808,841 $826,903Commercial real estate2,212 26,355 28,567 1,067,436 1,096,003Construction real estate: SEPH commercial land and development686 11,314 12,000 3,142 15,142Remaining commercial3,652 5,838 9,490 106,314 115,804Mortgage171 85 256 26,198 26,454Installment135 40 175 8,435 8,610Residential real estate: Commercial1,163 5,917 7,080 386,082 393,162Mortgage11,948 17,370 29,318 1,036,868 1,066,186HELOC620 309 929 212,868 213,797Installment563 787 1,350 42,576 43,926Consumer12,924 2,688 15,612 639,153 654,765Leases— — — 3,157 3,157Total loans$40,325 $82,514 $122,839 $4,341,070 $4,463,909* Includes $3.0 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans and accruing troubled debt restructurings.

[2] * Includes $1.7 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans and accruing troubled debt restructurings.

[3] Included within commercial, financial and agricultural loans, commercial real estate loans, and SEPH commercial land and development loans is an immaterial amount of consumer loans that are not broken out by class.