Allowance For Loan Losses (Composition Of The Allowance For Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	$ 7,466		$ 8,276
Allowance for loan losses collectively evaluated for impairment	47,645		47,261
Total ending allowance balance	55,111		55,537
Loans individually evaluated for impairment	126,080		137,238
Loans collectively evaluated for impairment	4,384,636		4,313,084
Total ending loan balance, net of accrued interest receivable	4,510,716		4,450,322
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment	5.92%		6.03%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment	1.09%		1.10%
Total ending allowance for loan losses balance as a percentage of loan balance	1.22%		1.25%
Recorded investment	126,102		137,339
Recorded investment collectively evaluated for impairment	4,398,735		4,326,570
Recorded Investment	4,524,837		4,463,909
Commercial, Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	3,210		3,180
Allowance for loan losses collectively evaluated for impairment	12,181		12,455
Total ending allowance balance	15,391		15,635
Loans individually evaluated for impairment	20,154		22,523
Loans collectively evaluated for impairment	786,555		801,404
Total ending loan balance, net of accrued interest receivable	806,709	[1]	823,927	[1]
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment	15.93%		14.12%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment	1.55%		1.55%
Total ending allowance for loan losses balance as a percentage of loan balance	1.91%		1.90%
Recorded investment	20,154		22,587
Recorded investment collectively evaluated for impairment	789,739		804,316
Recorded Investment	809,893	[1]	826,903	[1]
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	703		1,540
Allowance for loan losses collectively evaluated for impairment	10,322		10,196
Total ending allowance balance	11,025		11,736
Loans individually evaluated for impairment	42,117		44,267
Loans collectively evaluated for impairment	1,071,134		1,047,897
Total ending loan balance, net of accrued interest receivable	1,113,251	[1]	1,092,164	[1]
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment	1.67%		3.48%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment	0.96%		0.97%
Total ending allowance for loan losses balance as a percentage of loan balance	0.99%		1.07%
Recorded investment	42,128		44,278
Recorded investment collectively evaluated for impairment	1,074,812		1,051,725
Recorded Investment	1,116,940	[1]	1,096,003	[1]
Construction Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	2,580		2,277
Allowance for loan losses collectively evaluated for impairment	4,552		4,564
Total ending allowance balance	7,132		6,841
Loans individually evaluated for impairment	27,598		34,814
Loans collectively evaluated for impairment	128,270		130,714
Total ending loan balance, net of accrued interest receivable	155,868		165,528
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment	9.35%		6.54%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment	3.55%		3.49%
Total ending allowance for loan losses balance as a percentage of loan balance	4.58%		4.13%
Recorded investment	27,609		34,834
Recorded investment collectively evaluated for impairment	128,664		131,176
Recorded Investment	156,273		166,010
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment	973		1,279
Allowance for loan losses collectively evaluated for impairment	13,674		13,480
Total ending allowance balance	14,647		14,759
Loans individually evaluated for impairment	35,412		35,616
Loans collectively evaluated for impairment	1,705,350		1,678,029
Total ending loan balance, net of accrued interest receivable	1,740,762		1,713,645
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment	2.75%		3.59%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment	0.80%		0.80%
Total ending allowance for loan losses balance as a percentage of loan balance	0.84%		0.86%
Recorded investment	35,412		35,622
Recorded investment collectively evaluated for impairment	1,709,371		1,681,449
Recorded Investment	1,744,783		1,717,071
Consumer [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	6,916		6,566
Total ending allowance balance	6,916		6,566
Loans individually evaluated for impairment	799		18
Loans collectively evaluated for impairment	690,093		651,912
Total ending loan balance, net of accrued interest receivable	690,892		651,930
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	1.00%		1.01%
Total ending allowance for loan losses balance as a percentage of loan balance	1.00%		1.01%
Recorded investment	799		18
Recorded investment collectively evaluated for impairment	692,887		654,747
Recorded Investment	693,686		654,765
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	3,234		3,128
Total ending loan balance, net of accrued interest receivable	3,234		3,128
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	3,262		3,157
Recorded Investment	$ 3,262		$ 3,157

[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.