Loans (Recorded Investment By Loan Grade) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010
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
Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	2,361,879	2,316,438
Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	2,742,480	2,809,108
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] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	47,636	66,031
Vision Commercial Land And Development [Member] | Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	102,503	171,616
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] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	107,406	116,152
Remaining Commercial [Member] | Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	163,947	196,315
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] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	373,603	358,756
Residential Real Estate - Commercial [Member] | Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	457,946	466,306
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] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	691,768	683,743
Commercial, Financial, And Agricultural [Member] | Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	759,880	740,788
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] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	1,139,262	1,089,093
Commercial Real Estate [Member] | Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	1,256,000	1,231,420
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] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	2,204	2,663
Leases [Member] | Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	$ 2,204	$ 2,663