Loans (Recorded Investment By Loan Grade) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2011	Dec. 31, 2010
5 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	$ 116,507	$ 137,163
6 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	83,512	103,559
Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	201,291	251,948
Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	2,370,869	2,316,438
Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	2,772,179	2,809,108
Residential Real Estate - Commercial [Member] | 5 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	22,779	29,206
Residential Real Estate - Commercial [Member] | 6 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	17,398	18,117
Residential Real Estate - Commercial [Member] | Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	48,594	60,227
Residential Real Estate - Commercial [Member] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	367,446	358,756
Residential Real Estate - Commercial [Member] | Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	456,217	466,306
Commercial, Financial And Agricultural [Member] | 5 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	18,067	26,322
Commercial, Financial And Agricultural [Member] | 6 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	12,540	11,447
Commercial, Financial And Agricultural [Member] | Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	24,008	19,276
Commercial, Financial And Agricultural [Member] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	703,804	683,743
Commercial, Financial And Agricultural [Member] | Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	758,419	740,788
Commercial Real Estate [Member] | 5 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	57,223	57,394
Commercial Real Estate [Member] | 6 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	26,431	26,992
Commercial Real Estate [Member] | Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	47,243	57,941
Commercial Real Estate [Member] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	1,131,170	1,089,093
Commercial Real Estate [Member] | Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	1,262,067	1,231,420
Construction Real Estate [Member] | Vision Commercial Land And Development [Member] | 5 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	9,943	10,220
Construction Real Estate [Member] | Vision Commercial Land And Development [Member] | 6 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	4,803	7,941
Construction Real Estate [Member] | Vision Commercial Land And Development [Member] | Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	47,761	87,424
Construction Real Estate [Member] | Vision Commercial Land And Development [Member] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	48,782	66,031
Construction Real Estate [Member] | Vision Commercial Land And Development [Member] | Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	111,289	171,616
Construction Real Estate [Member] | Remaining Commercial [Member] | 5 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	8,495	14,021
Construction Real Estate [Member] | Remaining Commercial [Member] | 6 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	22,340	39,062
Construction Real Estate [Member] | Remaining Commercial [Member] | Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	33,685	27,080
Construction Real Estate [Member] | Remaining Commercial [Member] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	117,355	116,152
Construction Real Estate [Member] | Remaining Commercial [Member] | Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	181,875	196,315
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] | Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans
Leases [Member] | Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	2,312	2,663
Leases [Member] | Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Loans	$ 2,312	$ 2,663