Allowance For Loan Losses (Activity In The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	$ 3,800
Financing Receivable, Allowance for Credit Losses, Write-downs	3,708	$ 3,401
Financing Receivable, Allowance for Credit Losses, Recovery	2,130	2,945
Financing Receivables Allowance For Credit Losses Net Charge Offs	1,578	456
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	50,624	56,494
Ending balance	49,922	56,948
Provision for Loan, Lease, and Other Losses	876	910
Commercial Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	339	274
Financing Receivable, Allowance for Credit Losses, Recovery	369	427
Financing Receivables Allowance For Credit Losses Net Charge Offs	(30)	(153)
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	13,434	13,694
Ending balance	13,437	14,240
Provision for Loan, Lease, and Other Losses	(27)	393
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	112	1
Financing Receivable, Allowance for Credit Losses, Recovery	114	218
Financing Receivables Allowance For Credit Losses Net Charge Offs	(2)	(217)
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,432	9,197
Ending balance	10,281	9,452
Provision for Loan, Lease, and Other Losses	(153)	38
Construction Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	27	0
Financing Receivable, Allowance for Credit Losses, Recovery	58	939
Financing Receivables Allowance For Credit Losses Net Charge Offs	(31)	(939)
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,247	8,564
Ending balance	4,368	8,687
Provision for Loan, Lease, and Other Losses	(910)	(816)
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	480	747
Financing Receivable, Allowance for Credit Losses, Recovery	291	471
Financing Receivables Allowance For Credit Losses Net Charge Offs	189	276
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,958	13,514
Ending balance	10,745	13,388
Provision for Loan, Lease, and Other Losses	(24)	150
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	2,750	2,379
Financing Receivable, Allowance for Credit Losses, Recovery	1,298	890
Financing Receivables Allowance For Credit Losses Net Charge Offs	1,452	1,489
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,553	11,524
Ending balance	11,091	11,180
Provision for Loan, Lease, and Other Losses	1,990	1,145
Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	0	0
Financing Receivable, Allowance for Credit Losses, Recovery	0	0
Financing Receivables Allowance For Credit Losses Net Charge Offs	0	0
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	1
Ending balance	0	1
Provision for Loan, Lease, and Other Losses	$ 0	$ 0