Allowance For Loan Losses (Activity In The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	$ 4,377	$ 4,140	$ 11,131	$ 11,960
Financing Receivable, Allowance for Credit Losses, Recovery	2,504	6,369	6,999	12,847
Financing Receivables Allowance For Credit Losses Net Charge Offs	1,873	(2,229)	4,132	(887)
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	53,822	58,699	50,624	56,494
Ending balance	55,232	53,562	55,232	53,562
Provision for Loan, Lease, and Other Losses	3,283	(7,366)	8,740	(3,819)
Commercial Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	626	457	1,283	1,601
Financing Receivable, Allowance for Credit Losses, Recovery	115	246	647	889
Financing Receivables Allowance For Credit Losses Net Charge Offs	511	211	636	712
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	16,746	16,478	13,434	13,694
Ending balance	17,977	16,270	17,977	16,270
Provision for Loan, Lease, and Other Losses	1,742	3	5,179	3,288
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	628	4	1,050	82
Financing Receivable, Allowance for Credit Losses, Recovery	13	973	368	3,005
Financing Receivables Allowance For Credit Losses Net Charge Offs	615	(969)	682	(2,923)
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,451	9,203	10,432	9,197
Ending balance	10,172	10,573	10,172	10,573
Provision for Loan, Lease, and Other Losses	336	401	422	(1,547)
Construction Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	78	1,300	105	1,318
Financing Receivable, Allowance for Credit Losses, Recovery	303	3,659	686	4,708
Financing Receivables Allowance For Credit Losses Net Charge Offs	(225)	(2,359)	(581)	(3,390)
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,677	8,256	5,247	8,564
Ending balance	5,401	5,358	5,401	5,358
Provision for Loan, Lease, and Other Losses	499	(5,257)	(427)	(6,596)
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	217	293	987	1,776
Financing Receivable, Allowance for Credit Losses, Recovery	1,061	348	1,688	1,226
Financing Receivables Allowance For Credit Losses Net Charge Offs	(844)	(55)	(701)	550
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,319	13,180	10,958	13,514
Ending balance	10,085	11,328	10,085	11,328
Provision for Loan, Lease, and Other Losses	(1,078)	(1,907)	(1,574)	(1,636)
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	2,828	2,086	7,706	7,183
Financing Receivable, Allowance for Credit Losses, Recovery	1,011	1,142	3,609	3,017
Financing Receivables Allowance For Credit Losses Net Charge Offs	1,817	944	4,097	4,166
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	11,629	11,581	10,553	11,524
Ending balance	11,597	10,033	11,597	10,033
Provision for Loan, Lease, and Other Losses	1,785	(604)	5,141	2,675
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	1	1	1	2
Financing Receivables Allowance For Credit Losses Net Charge Offs	(1)	(1)	(1)	(2)
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	1	0	1
Ending balance	0	0	0	0
Provision for Loan, Lease, and Other Losses	$ (1)	$ (2)	$ (1)	$ (3)