Allowance For Loan Losses (Activity In The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 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	3,046	$ 4,419	$ 6,754	$ 7,820
Financing Receivable, Allowance for Credit Losses, Recovery	2,365	3,533	4,495	6,478
Financing Receivables Allowance For Credit Losses Net Charge Offs	681	886	2,259	1,342
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	49,922	56,948	50,624	56,494
Ending balance	53,822	58,699	53,822	58,699
Provision for Loan, Lease, and Other Losses	4,581	2,637	5,457	3,547
Commercial Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	318	870	657	1,144
Financing Receivable, Allowance for Credit Losses, Recovery	163	216	532	643
Financing Receivables Allowance For Credit Losses Net Charge Offs	155	654	125	501
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	13,437	14,240	13,434	13,694
Ending balance	16,746	16,478	16,746	16,478
Provision for Loan, Lease, and Other Losses	3,464	2,892	3,437	3,285
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	310	77	422	78
Financing Receivable, Allowance for Credit Losses, Recovery	241	1,814	355	2,032
Financing Receivables Allowance For Credit Losses Net Charge Offs	69	(1,737)	67	(1,954)
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,281	9,452	10,432	9,197
Ending balance	10,451	9,203	10,451	9,203
Provision for Loan, Lease, and Other Losses	239	(1,986)	86	(1,948)
Construction Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	0	18	27	18
Financing Receivable, Allowance for Credit Losses, Recovery	325	110	383	1,049
Financing Receivables Allowance For Credit Losses Net Charge Offs	(325)	(92)	(356)	(1,031)
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,368	8,687	5,247	8,564
Ending balance	4,677	8,256	4,677	8,256
Provision for Loan, Lease, and Other Losses	(16)	(523)	(926)	(1,339)
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	290	736	770	1,483
Financing Receivable, Allowance for Credit Losses, Recovery	336	407	627	878
Financing Receivables Allowance For Credit Losses Net Charge Offs	(46)	329	143	605
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,745	13,388	10,958	13,514
Ending balance	10,319	13,180	10,319	13,180
Provision for Loan, Lease, and Other Losses	(472)	121	(496)	271
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	2,128	2,718	4,878	5,097
Financing Receivable, Allowance for Credit Losses, Recovery	1,300	985	2,598	1,875
Financing Receivables Allowance For Credit Losses Net Charge Offs	828	1,733	2,280	3,222
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	11,091	11,180	10,553	11,524
Ending balance	11,629	11,581	11,629	11,581
Provision for Loan, Lease, and Other Losses	1,366	2,134	3,356	3,279
Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Recovery	0	1	0	1
Financing Receivables Allowance For Credit Losses Net Charge Offs	0	(1)	0	(1)
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	1	0	1
Ending balance	0	1	0	1
Provision for Loan, Lease, and Other Losses	$ 0	$ (1)	$ 0	$ (1)