Loans (Recorded Investment By Loan Grade) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	$ 4,415,655		$ 4,331,783
Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	396,783		396,929
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	1,085,974	[1]	1,112,809	[1]
Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	3,486		2,102
5 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	57,292		76,434
5 Rated [Member] | SEPH Commercial Land and Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	893	[2]
5 Rated [Member] | Vision Commercial Land And Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment			3,102	[3]
5 Rated [Member] | Remaining Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	7,903		6,982
5 Rated [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	10,964		17,120
5 Rated [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	5,655	[2]	11,785	[3]
5 Rated [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	31,877	[2]	37,445	[3]
5 Rated [Member] | Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment
6 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	20,427		30,184
6 Rated [Member] | SEPH Commercial Land and Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		[2]
6 Rated [Member] | Vision Commercial Land And Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment				[3]
6 Rated [Member] | Remaining Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment			8,311
6 Rated [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	1,327		3,785
6 Rated [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	12,942	[2]	7,628	[3]
6 Rated [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	6,158	[2]	10,460	[3]
6 Rated [Member] | Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment
Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	143,058		188,572
Impaired [Member] | SEPH Commercial Land and Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	13,965	[2]
Impaired [Member] | Vision Commercial Land And Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment			25,761	[3]
Impaired [Member] | Remaining Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	27,418		25,912
Impaired [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	36,583		44,276
Impaired [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	22,114	[2]	40,645	[3]
Impaired [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	42,978	[2]	51,978	[3]
Impaired [Member] | Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment
Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	2,196,496		2,151,649
Pass Rated [Member] | SEPH Commercial Land and Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	968	[2]
Pass Rated [Member] | Vision Commercial Land And Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment			2,771	[3]
Pass Rated [Member] | Remaining Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	103,726		115,242
Pass Rated [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	347,909		331,748
Pass Rated [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	735,446	[2]	686,860	[3]
Pass Rated [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	1,004,961	[2]	1,012,926	[3]
Pass Rated [Member] | Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	3,486		2,102
Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	2,417,273		2,446,839
Recorded Investment [Member] | SEPH Commercial Land and Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	15,826	[2]
Recorded Investment [Member] | Vision Commercial Land And Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment			31,634	[3]
Recorded Investment [Member] | Remaining Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	139,047		156,447
Recorded Investment [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	396,783		396,929
Recorded Investment [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	776,157	[2]	746,918	[3]
Recorded Investment [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	1,085,974	[2]	1,112,809	[3]
Recorded Investment [Member] | Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	$ 3,486		$ 2,102

[1] 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.

[2] * 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.

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