Loans (Recorded Investment By Loan Grade) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
5 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	$ 67,057	$ 76,434
5 Rated [Member] | Vision/SE LLC Commercial Land And Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	2,801	3,102
5 Rated [Member] | Remaining Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	6,748	6,982
5 Rated [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	16,793	17,120
5 Rated [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	10,458	11,785
5 Rated [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	30,257	37,445
6 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	17,716	30,184
6 Rated [Member] | Remaining Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	232	8,311
6 Rated [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	1,469	3,785
6 Rated [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	5,217	7,628
6 Rated [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	10,798	10,460
Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	180,512	188,572
Impaired [Member] | Vision/SE LLC Commercial Land And Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	20,518	25,761
Impaired [Member] | Remaining Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	32,673	25,912
Impaired [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	43,752	44,276
Impaired [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	40,264	40,645
Impaired [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	43,305	51,978
Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	2,153,829	2,151,649
Pass Rated [Member] | Vision/SE LLC Commercial Land And Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	2,801	2,771
Pass Rated [Member] | Remaining Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	109,694	115,242
Pass Rated [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	331,658	331,748
Pass Rated [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	699,892	686,860
Pass Rated [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	1,007,783	1,012,926
Pass Rated [Member] | Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	2,001	2,102
Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	2,419,114	2,446,839
Recorded Investment [Member] | Vision/SE LLC Commercial Land And Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	26,120	31,634
Recorded Investment [Member] | Remaining Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	149,347	156,447
Recorded Investment [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	393,672	396,929
Recorded Investment [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	755,831	746,918
Recorded Investment [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	1,092,143	1,112,809
Recorded Investment [Member] | Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	$ 2,001	$ 2,102