Loans (Aging Of Recorded Investment In Past Due Loans) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2011		Dec. 31, 2010
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	$ 41,574		$ 49,393
Past due nonaccrual loans and loans past due 90 days or more and accruing	158,261	[1]	209,546	[2]
Total past due	199,835		258,939
Total current	4,526,192		4,491,251
Recorded investment	4,726,027		4,750,190
Loans past due 90 days or more and accruing	3,192		3,693
Commercial, Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	6,007		2,247
Past due nonaccrual loans and loans past due 90 days or more and accruing	21,096	[1]	15,622	[2]
Total past due	27,103		17,869
Total current	731,316		722,919
Recorded investment	758,419	[3]	740,788	[3]
Loans past due 90 days or more and accruing	25
Construction Real Estate - Vision Commercial Land And Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	309		2,406
Past due nonaccrual loans and loans past due 90 days or more and accruing	41,860	[1]	65,130	[2]
Total past due	42,169		67,536
Total current	69,120		104,080
Recorded investment	111,289	[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	99		141
Past due nonaccrual loans and loans past due 90 days or more and accruing	13,757	[1]	19,687	[2]
Total past due	13,856		19,828
Total current	168,019		176,487
Recorded investment	181,875		196,315
Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	402		479
Past due nonaccrual loans and loans past due 90 days or more and accruing			148	[2]
Total past due	402		627
Total current	21,034		25,794
Recorded investment	21,436		26,421
Loans past due 90 days or more and accruing
Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	393		235
Past due nonaccrual loans and loans past due 90 days or more and accruing	386	[1]	399	[2]
Total past due	779		634
Total current	15,784		12,547
Recorded investment	16,563		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	3,014		3,281
Past due nonaccrual loans and loans past due 90 days or more and accruing	18,461	[1]	26,845	[2]
Total past due	21,475		30,126
Total current	434,742		436,180
Recorded investment	456,217		466,306
Loans past due 90 days or more and accruing	861
Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	17,041		17,460
Past due nonaccrual loans and loans past due 90 days or more and accruing	22,893	[1]	24,422	[2]
Total past due	39,934		41,882
Total current	912,619		867,555
Recorded investment	952,553		909,437
Loans past due 90 days or more and accruing	1,676		2,175
Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	770		1,396
Past due nonaccrual loans and loans past due 90 days or more and accruing	664	[1]	667	[2]
Total past due	1,434		2,063
Total current	254,393		259,414
Recorded investment	255,827		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	1,120		1,018
Past due nonaccrual loans and loans past due 90 days or more and accruing	781	[1]	892	[2]
Total past due	1,901		1,910
Total current	51,380		58,540
Recorded investment	53,281		60,450
Loans past due 90 days or more and accruing	1		277
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	3,106		9,521
Past due nonaccrual loans and loans past due 90 days or more and accruing	36,369	[1]	53,269	[2]
Total past due	39,475		62,790
Total current	1,222,592		1,168,630
Recorded investment	1,262,067	[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	9,313		11,204
Past due nonaccrual loans and loans past due 90 days or more and accruing	1,994	[1]	2,465	[2]
Total past due	11,307		13,669
Total current	642,881		656,447
Recorded investment	654,188		670,116
Loans past due 90 days or more and accruing	629		1,059
Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days			5
Total past due			5
Total current	2,312		2,658
Recorded investment	2,312		2,663
Loans past due 90 days or more and accruing

[1] Includes $3.2 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.