Loans (Loans Individually And Collectively Evaluated For Impairment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	$ 8,260	$ 8,276
Nonaccrual and accruing restructured loans	175,896	185,482
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	130,303	137,339
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	45,593	48,143
Partial Charge-Offs On Impaired Loans	102,900	105,100
Commercial, Financial And Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	21,753	22,601
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	21,742	22,587
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	11	14
Construction Real Estate - Vision/SEPH Commercial Land And Development [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	11,133	13,939
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	10,482	13,260
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	651	679
Construction Real Estate - Remaining Commercial [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	20,483	21,574
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	20,483	21,574
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment
Construction Real Estate - Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	245	258
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	245	258
Construction Real Estate - Installment [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	300	324
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	300	324
Residential Real Estate - Commercial [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	36,722	35,622
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	36,722	35,622
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment
Residential Real Estate - Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	35,064	37,685
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	35,064	37,685
Residential Real Estate - HELOC [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	2,617	2,425
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	2,617	2,425
Residential Real Estate - Installment [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	2,221	2,450
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	2,221	2,450
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	648	1,540
Nonaccrual and accruing restructured loans	40,075	44,278
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	40,075	44,278
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0
Nonaccrual and accruing restructured loans	5,283	4,326
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	799	18
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	4,484	4,308
Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Partial Charge-Offs On Impaired Loans	$ 96,900	$ 96,900