Loans (Aging Of Recorded Investment In Past Due Loans) (Details) (USD $) In Thousands	Sep. 30, 2011		Dec. 31, 2010
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	$ 39,571		$ 49,393
Past due nonaccrual loans and loans past due 90 days or more and accruing	135,318	[1]	209,546	[2]
Total loans past due	174,889		258,939
Total current	4,520,955		4,491,251
Total recorded investment	4,695,844		4,750,190
Loans past due 90 days or more and accruing	2,222		3,693
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	9,543		9,521
Past due nonaccrual loans and loans past due 90 days or more and accruing	23,119	[1]	53,269	[2]
Total loans past due	32,662		62,790
Total current	1,223,338		1,168,630
Total recorded investment	1,256,000	[3]	1,231,420	[3]
Loans past due 90 days or more and accruing			20
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	9,799		11,204
Past due nonaccrual loans and loans past due 90 days or more and accruing	2,061	[1]	2,465	[2]
Total loans past due	11,860		13,669
Total current	631,086		656,447
Total recorded investment	642,946		670,116
Loans past due 90 days or more and accruing	851		1,059
Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days			5
Total loans past due			5
Total current	2,204		2,658
Total recorded investment	2,204		2,663
Loans past due 90 days or more and accruing
Commercial, Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	2,211		2,247
Past due nonaccrual loans and loans past due 90 days or more and accruing	16,457	[1]	15,622	[2]
Total loans past due	18,668		17,869
Total current	741,212		722,919
Total recorded investment	759,880	[3]	740,788	[3]
Loans past due 90 days or more and accruing	22
Construction Real Estate - Vision Commercial Land And Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	425		2,406
Past due nonaccrual loans and loans past due 90 days or more and accruing	35,654	[1]	65,130	[2]
Total loans past due	36,079		67,536
Total current	66,424		104,080
Total recorded investment	102,503	[3]	171,616	[3]
Construction Real Estate - Remaining Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days			141
Past due nonaccrual loans and loans past due 90 days or more and accruing	17,807	[1]	19,687	[2]
Total loans past due	17,807		19,828
Total current	146,140		176,487
Total recorded investment	163,947		196,315
Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	145		479
Past due nonaccrual loans and loans past due 90 days or more and accruing	66	[1]	148	[2]
Total loans past due	211		627
Total current	19,708		25,794
Total recorded investment	19,919		26,421
Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	202		235
Past due nonaccrual loans and loans past due 90 days or more and accruing	69	[1]	399	[2]
Total loans past due	271		634
Total current	14,801		12,547
Total recorded investment	15,072		13,181
Loans past due 90 days or more and accruing			13
Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	1,264		3,281
Past due nonaccrual loans and loans past due 90 days or more and accruing	17,295	[1]	26,845	[2]
Total loans past due	18,559		30,126
Total current	439,387		436,180
Total recorded investment	457,946		466,306
Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	14,015		17,460
Past due nonaccrual loans and loans past due 90 days or more and accruing	21,618	[1]	24,422	[2]
Total loans past due	35,633		41,882
Total current	934,052		867,555
Total recorded investment	969,685		909,437
Loans past due 90 days or more and accruing	1,237		2,175
Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	539		1,396
Past due nonaccrual loans and loans past due 90 days or more and accruing	673	[1]	667	[2]
Total loans past due	1,212		2,063
Total current	253,208		259,414
Total recorded investment	254,420		261,477
Loans past due 90 days or more and accruing			149
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	1,428		1,018
Past due nonaccrual loans and loans past due 90 days or more and accruing	499	[1]	892	[2]
Total loans past due	1,927		1,910
Total current	49,395		58,540
Total recorded investment	51,322		60,450
Loans past due 90 days or more and accruing	$ 112		$ 277

[1] Includes $2.2 million of loans past due 90 days or more and accruing.

[2] Includes $3.6 million of loans past due 90 days or more and accruing.

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