Allowance For Loan Losses (Composition Of The Allowance For Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	$ 6,343		$ 10,451
Allowance for loan losses collectively evaluated for impairment	51,568		49,017
Total ending allowance balance	57,911		59,468
Loans individually evaluated for impairment	95,974		112,304
Loans collectively evaluated for impairment	4,639,513		4,508,201
Total ending loan balance, net of accrued interest receivable	4,735,487		4,620,505
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment	6.61%		9.31%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment	1.11%		1.09%
Total ending allowance for loan losses balance as a percentage of loan balance	1.22%		1.29%
Recorded investment	96,005		112,315
Recorded investment collectively evaluated for impairment	4,652,593		4,521,684
Recorded Investment	4,748,598		4,633,999
Commercial Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	2,860		3,268
Allowance for loan losses collectively evaluated for impairment	11,336		10,950
Total ending allowance balance	14,196		14,218
Loans individually evaluated for impairment	17,628		20,724
Loans collectively evaluated for impairment	800,266		804,708
Total ending loan balance, net of accrued interest receivable	817,894	[1]	825,432	[1]
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment	16.22%		15.77%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment	1.42%		1.36%
Total ending allowance for loan losses balance as a percentage of loan balance	1.74%		1.72%
Recorded investment	17,628		20,727
Recorded investment collectively evaluated for impairment	803,206		807,784
Recorded Investment	820,834	[1]	828,511	[1]
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	781		5,496
Allowance for loan losses collectively evaluated for impairment	10,281		10,403
Total ending allowance balance	11,062		15,899
Loans individually evaluated for impairment	35,135		41,816
Loans collectively evaluated for impairment	1,064,641		1,070,457
Total ending loan balance, net of accrued interest receivable	1,099,776	[1]	1,112,273	[1]
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment	2.22%		13.14%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment	0.97%		0.97%
Total ending allowance for loan losses balance as a percentage of loan balance	1.01%		1.43%
Recorded investment	35,138		41,822
Recorded investment collectively evaluated for impairment	1,067,973		1,074,216
Recorded Investment	1,103,111	[1]	1,116,038	[1]
Construction Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	2,174		1,132
Allowance for loan losses collectively evaluated for impairment	5,647		5,723
Total ending allowance balance	7,821		6,855
Loans individually evaluated for impairment	14,336		15,559
Loans collectively evaluated for impairment	140,656		140,557
Total ending loan balance, net of accrued interest receivable	154,992		156,116
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment	15.16%		7.28%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment	4.01%		4.07%
Total ending allowance for loan losses balance as a percentage of loan balance	5.05%		4.39%
Recorded investment	14,332		15,559
Recorded investment collectively evaluated for impairment	141,060		140,944
Recorded Investment	155,392		156,503
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	447		555
Allowance for loan losses collectively evaluated for impairment	14,072		13,696
Total ending allowance balance	14,519		14,251
Loans individually evaluated for impairment	28,743		33,406
Loans collectively evaluated for impairment	1,799,406		1,766,141
Total ending loan balance, net of accrued interest receivable	1,828,149		1,799,547
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment	1.56%		1.66%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment	0.78%		0.78%
Total ending allowance for loan losses balance as a percentage of loan balance	0.79%		0.79%
Recorded investment	28,775		33,408
Recorded investment collectively evaluated for impairment	1,802,999		1,769,604
Recorded Investment	1,831,774		1,803,012
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	81		0
Allowance for loan losses collectively evaluated for impairment	10,232		8,245
Total ending allowance balance	10,313		8,245
Loans individually evaluated for impairment	132		799
Loans collectively evaluated for impairment	831,322		722,934
Total ending loan balance, net of accrued interest receivable	831,454		723,733
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment	61.36%		0.00%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment	1.23%		1.14%
Total ending allowance for loan losses balance as a percentage of loan balance	1.24%		1.14%
Recorded investment	132		799
Recorded investment collectively evaluated for impairment	834,101		725,709
Recorded Investment	834,233		726,508
Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	0		0
Allowance for loan losses collectively evaluated for impairment	0		0
Total ending allowance balance	0		0
Loans individually evaluated for impairment	0		0
Loans collectively evaluated for impairment	3,222		3,404
Total ending loan balance, net of accrued interest receivable	3,222		3,404
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment	0.00%		0.00%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment	0.00%		0.00%
Total ending allowance for loan losses balance as a percentage of loan balance	0.00%		0.00%
Recorded investment	0		0
Recorded investment collectively evaluated for impairment	3,254		3,427
Recorded Investment	$ 3,254		$ 3,427

[1] Included within commercial, financial and agricultural loans, commercial real estate loans, and SEPH commercial land and development loans is an immaterial amount of consumer loans that are not broken out by class.