Loans (Aging Of Recorded Investment In Past Due Loans) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	$ 36,645		$ 37,517
Past due nonaccrual loans and loans past due 90 days or more and accruing	77,146	[1]	94,663	[2]
Total loans past due	113,791		132,180
Total current	4,301,864		4,199,603
Recorded Investment	4,415,655		4,331,783
Loans past due 90 days or more and accruing	2,131		3,561
Commercial, Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	2,096		3,106
Past due nonaccrual loans and loans past due 90 days or more and accruing	12,214	[1]	11,308	[2]
Total loans past due	14,310		14,414
Total current	761,847		732,504
Recorded Investment	776,157		746,918
Loans past due 90 days or more and accruing	0
Construction Real Estate - Vision/SEPH Commercial Land And Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	497
Past due nonaccrual loans and loans past due 90 days or more and accruing	10,611	[1]	19,235	[2]
Total loans past due	11,108		19,235
Total current	4,718		12,399
Recorded Investment	15,826	[3]	31,634	[3]
Loans past due 90 days or more and accruing	0
Construction Real Estate - Remaining Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	47		99
Past due nonaccrual loans and loans past due 90 days or more and accruing	5,327	[1]	7,839	[2]
Total loans past due	5,374		7,938
Total current	133,673		148,509
Recorded Investment	139,047		156,447
Loans past due 90 days or more and accruing	0
Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	560		76
Past due nonaccrual loans and loans past due 90 days or more and accruing	85	[1]		[2]
Total loans past due	645		76
Total current	25,229		20,027
Recorded Investment	25,874		20,103
Loans past due 90 days or more and accruing	0
Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	284		421
Past due nonaccrual loans and loans past due 90 days or more and accruing	40	[1]	8	[2]
Total loans past due	324		429
Total current	8,503		9,483
Recorded Investment	8,827		9,912
Loans past due 90 days or more and accruing	0
Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	2,134		1,545
Past due nonaccrual loans and loans past due 90 days or more and accruing	9,002	[1]	10,097	[2]
Total loans past due	11,136		11,642
Total current	385,647		385,287
Recorded Investment	396,783		396,929
Loans past due 90 days or more and accruing	0
Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	12,397		15,879
Past due nonaccrual loans and loans past due 90 days or more and accruing	18,558	[1]	20,614	[2]
Total loans past due	30,955		36,493
Total current	1,018,631		918,787
Recorded Investment	1,049,586		955,280
Loans past due 90 days or more and accruing	1,132		2,610
Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	484		1,015
Past due nonaccrual loans and loans past due 90 days or more and accruing	634	[1]	436	[2]
Total loans past due	1,118		1,451
Total current	218,008		227,173
Recorded Investment	219,126		228,624
Loans past due 90 days or more and accruing	0
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	747		1,549
Past due nonaccrual loans and loans past due 90 days or more and accruing	781	[1]	1,136	[2]
Total loans past due	1,528		2,685
Total current	44,078		48,905
Recorded Investment	45,606		51,590
Loans past due 90 days or more and accruing	129		58
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	6,205		2,632
Past due nonaccrual loans and loans past due 90 days or more and accruing	16,830	[1]	21,798	[2]
Total loans past due	23,035		24,430
Total current	1,062,939		1,088,379
Recorded Investment	1,085,974	[3]	1,112,809	[3]
Loans past due 90 days or more and accruing	0
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	11,194		11,195
Past due nonaccrual loans and loans past due 90 days or more and accruing	3,064	[1]	2,192	[2]
Total loans past due	14,258		13,387
Total current	635,105		606,048
Recorded Investment	649,363		619,435
Loans past due 90 days or more and accruing	870		893
Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days
Past due nonaccrual loans and loans past due 90 days or more and accruing		[1]		[2]
Total loans past due
Total current	3,486		2,102
Recorded Investment	$ 3,486		$ 2,102

[1] Includes $2.1 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans. December 31, 2011(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$3,106 $11,308 $14,414 $732,504 $746,918Commercial real estate2,632 21,798 24,430 1,088,379 1,112,809Construction real estate: Vision commercial land and development— 19,235 19,235 12,399 31,634Remaining commercial99 7,839 7,938 148,509 156,447Mortgage76 — 76 20,027 20,103Installment421 8 429 9,483 9,912Residential real estate: Commercial1,545 10,097 11,642 385,287 396,929Mortgage15,879 20,614 36,493 918,787 955,280HELOC1,015 436 1,451 227,173 228,624Installment1,549 1,136 2,685 48,905 51,590Consumer11,195 2,192 13,387 606,048 619,435Leases— — — 2,102 2,102Total loans$37,517 $94,663 $132,180 $4,199,603 $4,331,783* Includes $3.6 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans.

[2] * Includes $2.1 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans.

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