Loans (Recorded Investment By Loan Grade) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Commercial, Financial, and Agricultural [Member] \| 5 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	$ 36,037	$ 26,322
Commercial, Financial, and Agricultural [Member] \| 6 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	7,150	11,447
Commercial, Financial, and Agricultural [Member] \| Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	24,925	19,276
Commercial, Financial, and Agricultural [Member] \| Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	759,880	740,788
Commercial, Financial, and Agricultural [Member] \| Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	691,768	683,743
Commercial Real Estate [Member] \| 5 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	51,417	57,394
Commercial Real Estate [Member] \| 6 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	21,222	26,992
Commercial Real Estate [Member] \| Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	44,099	57,941
Commercial Real Estate [Member] \| Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	1,256,000	1,231,420
Commercial Real Estate [Member] \| Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	1,139,262	1,089,093
Leases [Member] \| 5 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans
Leases [Member] \| 6 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans
Leases [Member] \| Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans
Leases [Member] \| Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	2,204	2,663
Leases [Member] \| Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	2,204	2,663
Vision Commercial Land And Development [Member] \| 5 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	10,791	10,220
Vision Commercial Land And Development [Member] \| 6 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	2,040	7,941
Vision Commercial Land And Development [Member] \| Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	42,036	87,424
Vision Commercial Land And Development [Member] \| Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	102,503	171,616
Vision Commercial Land And Development [Member] \| Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	47,636	66,031
Remaining Commercial [Member] \| 5 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	7,954	14,021
Remaining Commercial [Member] \| 6 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	14,626	39,062
Remaining Commercial [Member] \| Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	33,961	27,080
Remaining Commercial [Member] \| Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	163,947	196,315
Remaining Commercial [Member] \| Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	107,406	116,152
Residential Real Estate - Commercial [Member] \| 5 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	22,825	29,206
Residential Real Estate - Commercial [Member] \| 6 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	14,096	18,117
Residential Real Estate - Commercial [Member] \| Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	47,422	60,227
Residential Real Estate - Commercial [Member] \| Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	457,946	466,306
Residential Real Estate - Commercial [Member] \| Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	373,603	358,756
5 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	129,024	137,163
6 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	59,134	103,559
Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	192,443	251,948
Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	2,742,480	2,809,108
Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	$ 2,361,879	$ 2,316,438

Reflects the sum of the gross carrying amounts of the various categories of unpaid commercial loans and leases receivable, primarily issued to businesses. Includes: (1) commercial and industrial loans, consisting of general purpose loans to entities involved in producing, transporting, or merchandising products sold in the course of commerce; (2) agricultural loans consisting of borrowings used to finance major equipment and machinery purchases and expenses, livestock or crop production (including fisheries), and to supplement working capital needs of an entity engaged in farming operations; (3) mortgage loans secured by a [legal] security interest in real property [commercial building or business real property]; (4) obligation in the form of [promissory] notes, used for the funding of construction projects; (5) interbank and other loans to financial institutions for the purpose of liquidity management on the part of the borrower; (6) draws against credit facilities provided to companies involved in mortgage banking activities (warehousing); (7) amounts lent to businesses engaged in international activities (trade financing); (8) lease financings; and (9) loans to governmental entities.