Allowance For Loan Losses (Composition Of The Allowance For Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	$ 4,120		$ 10,451
Allowance for loan losses collectively evaluated for impairment	53,554		49,017
Total ending allowance balance	57,674		59,468
Loans individually evaluated for impairment	76,198		112,304
Loans collectively evaluated for impairment	4,694,235		4,506,535
Total ending loan balance, net of accrued interest receivable	4,770,433		4,618,839
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment	5.40697%		9.30599%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment	1.14085%		1.08769%
Total ending allowance for loan losses balance as a percentage of loan balance	1.20899%		1.28751%
Recorded investment	76,231		112,315
Recorded investment collectively evaluated for impairment	4,708,145		4,520,018
Recorded Investment	4,784,376		4,632,333
Commercial Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	1,652		3,268
Allowance for loan losses collectively evaluated for impairment	11,370		10,950
Total ending allowance balance	13,022		14,218
Loans individually evaluated for impairment	23,186		20,724
Loans collectively evaluated for impairment	786,364		804,708
Total ending loan balance, net of accrued interest receivable	809,550	[1]	825,432	[1]
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment	7.12499%		15.76916%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment	1.4459%		1.36074%
Total ending allowance for loan losses balance as a percentage of loan balance	1.60855%		1.72249%
Recorded investment	23,186		20,727
Recorded investment collectively evaluated for impairment	789,508		807,784
Recorded Investment	812,694	[1]	828,511	[1]
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	252		5,496
Allowance for loan losses collectively evaluated for impairment	10,177		10,403
Total ending allowance balance	10,429		15,899
Loans individually evaluated for impairment	21,298		41,816
Loans collectively evaluated for impairment	1,051,252		1,070,457
Total ending loan balance, net of accrued interest receivable	1,072,550	[1]	1,112,273	[1]
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment	1.18321%		13.14329%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment	0.96808%		0.97183%
Total ending allowance for loan losses balance as a percentage of loan balance	0.97236%		1.42942%
Recorded investment	21,303		41,822
Recorded investment collectively evaluated for impairment	1,055,117		1,074,216
Recorded Investment	1,076,420	[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	1,951		1,132
Allowance for loan losses collectively evaluated for impairment	6,703		5,723
Total ending allowance balance	8,654		6,855
Loans individually evaluated for impairment	8,067		15,559
Loans collectively evaluated for impairment	162,319		140,557
Total ending loan balance, net of accrued interest receivable	170,386		156,116
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment	24.18495%		7.27553%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment	4.12952%		4.07166%
Total ending allowance for loan losses balance as a percentage of loan balance	5.07906%		4.39097%
Recorded investment	8,067		15,559
Recorded investment collectively evaluated for impairment	162,789		140,944
Recorded Investment	170,856		156,503
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	230		555
Allowance for loan losses collectively evaluated for impairment	14,616		13,696
Total ending allowance balance	14,846		14,251
Loans individually evaluated for impairment	23,612		33,406
Loans collectively evaluated for impairment	1,807,508		1,764,475
Total ending loan balance, net of accrued interest receivable	1,831,120		1,797,881
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment	0.97408%		1.66138%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment	0.80863%		0.77621%
Total ending allowance for loan losses balance as a percentage of loan balance	0.81076%		0.79266%
Recorded investment	23,640		33,408
Recorded investment collectively evaluated for impairment	1,811,116		1,767,938
Recorded Investment	1,834,756		1,801,346
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	35		0
Allowance for loan losses collectively evaluated for impairment	10,688		8,245
Total ending allowance balance	10,723		8,245
Loans individually evaluated for impairment	35		799
Loans collectively evaluated for impairment	883,613		722,934
Total ending loan balance, net of accrued interest receivable	883,648		723,733
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment	100.00%		0.00%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment	1.20958%		1.14049%
Total ending allowance for loan losses balance as a percentage of loan balance	1.21349%		1.13923%
Recorded investment	35		799
Recorded investment collectively evaluated for impairment	886,380		725,709
Recorded Investment	886,415		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	3,179		3,404
Total ending loan balance, net of accrued interest receivable	3,179		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	3,235		3,427
Recorded Investment	$ 3,235		$ 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.