Loans (Recorded Investment By Loan Grade) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	$ 4,524,837		$ 4,463,909
Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	401,548		393,162
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	1,116,940	[1]	1,096,003	[1]
Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	3,262		3,157
5 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	46,229		51,292
5 Rated [Member] | SEPH Commercial Land and Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	385	[2]
5 Rated [Member] | Vision Commercial Land And Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment			411	[2]
5 Rated [Member] | Remaining Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	5,736		6,734
5 Rated [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	8,312		8,994
5 Rated [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	11,210	[2]	9,537	[2]
5 Rated [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	20,586	[2]	25,616	[2]
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	13,246		16,887
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				[2]
6 Rated [Member] | Remaining Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment
6 Rated [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	1,259		2,053
6 Rated [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	9,614	[2]	10,874	[2]
6 Rated [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	2,373	[2]	3,960	[2]
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	125,349		138,014
Impaired [Member] | SEPH Commercial Land and Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	9,103	[2]
Impaired [Member] | Vision Commercial Land And Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment			13,939	[2]
Impaired [Member] | Remaining Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	18,535		21,574
Impaired [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	35,412		35,622
Impaired [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	20,171	[2]	22,601	[2]
Impaired [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	42,128	[2]	44,278	[2]
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	2,270,781		2,243,978
Pass Rated [Member] | SEPH Commercial Land and Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	750	[2]
Pass Rated [Member] | Vision Commercial Land And Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment			792	[2]
Pass Rated [Member] | Remaining Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	89,453		87,496
Pass Rated [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	356,565		346,493
Pass Rated [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	768,898	[2]	783,891	[2]
Pass Rated [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	1,051,853	[2]	1,022,149	[2]
Pass Rated [Member] | Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	3,262		3,157
Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	2,455,605		2,450,171
Recorded Investment [Member] | SEPH Commercial Land and Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	10,238	[2]
Recorded Investment [Member] | Vision Commercial Land And Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment			15,142	[2]
Recorded Investment [Member] | Remaining Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	113,724		115,804
Recorded Investment [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	401,548		393,162
Recorded Investment [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	809,893	[2]	826,903	[2]
Recorded Investment [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	1,116,940	[2]	1,096,003	[2]
Recorded Investment [Member] | Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Recorded Investment	$ 3,262		$ 3,157

[1] 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.

[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.