Loans (Aging Of Recorded Investment In Past Due Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 contracts		Mar. 31, 2014 contracts	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	106		92
Accruing loans past due 30-89 days	$ 23,705			$ 31,074
Past due nonaccrual loans and loans past due 90 days or more and accruing	41,965	[1]		52,932	[2]
Total loans past due	65,670			84,006
Total current	4,778,826			4,759,305
Recorded Investment	4,844,496			4,843,311
Loans past due 90 days or more and accruing	1,672			2,709
Financing Receivable, Modifications, Recorded Investment, During Period	4,170		2,033
Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	13		5
Accruing loans past due 30-89 days	5,331			6,482
Past due nonaccrual loans and loans past due 90 days or more and accruing	6,019	[1]		7,508	[2]
Total loans past due	11,350			13,990
Total current	836,248			845,763
Loans past due 90 days or more and accruing	73			229
Financing Receivable, Modifications, Recorded Investment, During Period	995		60
Construction Real Estate, SEPH Commercial Land and Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	0
Past due nonaccrual loans and loans past due 90 days or more and accruing	2,069	[1]		2,068	[2]
Total loans past due	2,069			2,068
Total current	114			127
Recorded Investment	2,183	[3]		2,195	[3]
Loans past due 90 days or more and accruing	0			0
Construction Real Estate - Remaining Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	0		0
Accruing loans past due 30-89 days	163			166
Past due nonaccrual loans and loans past due 90 days or more and accruing	75	[1]		77	[2]
Total loans past due	238			243
Total current	109,875			115,196
Recorded Investment	110,113			115,439
Loans past due 90 days or more and accruing	0			0
Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	1		0
Accruing loans past due 30-89 days	108			39
Past due nonaccrual loans and loans past due 90 days or more and accruing	68	[1]		68	[2]
Total loans past due	176			107
Total current	30,791			31,113
Recorded Investment	30,967			31,220
Loans past due 90 days or more and accruing	0			9
Financing Receivable, Modifications, Recorded Investment, During Period	21
Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	0		0
Accruing loans past due 30-89 days	116			21
Past due nonaccrual loans and loans past due 90 days or more and accruing	6	[1]		25	[2]
Total loans past due	122			46
Total current	6,791			7,299
Recorded Investment	6,913			7,345
Loans past due 90 days or more and accruing	0			0
Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	3		2
Accruing loans past due 30-89 days	447			250
Past due nonaccrual loans and loans past due 90 days or more and accruing	19,015	[1]		19,592	[2]
Total loans past due	19,462			19,842
Total current	394,296			398,808
Recorded Investment	413,758			418,650
Loans past due 90 days or more and accruing	0
Financing Receivable, Modifications, Recorded Investment, During Period	513		68
Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	7		7
Accruing loans past due 30-89 days	8,985			11,146
Past due nonaccrual loans and loans past due 90 days or more and accruing	9,176	[1]		10,637	[2]
Total loans past due	18,161			21,783
Total current	1,180,706			1,169,474
Recorded Investment	1,198,867			1,191,257
Loans past due 90 days or more and accruing	719			1,329
Financing Receivable, Modifications, Recorded Investment, During Period	534		659
Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	10		0
Accruing loans past due 30-89 days	490			262
Past due nonaccrual loans and loans past due 90 days or more and accruing	132	[1]		387	[2]
Total loans past due	622			649
Total current	213,792			217,069
Recorded Investment	214,414			217,718
Loans past due 90 days or more and accruing	0			9
Financing Receivable, Modifications, Recorded Investment, During Period	301		0
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	202			596
Past due nonaccrual loans and loans past due 90 days or more and accruing	454	[1]		464	[2]
Total loans past due	656			1,060
Total current	25,320			26,176
Recorded Investment	25,976			27,236
Loans past due 90 days or more and accruing	64
Financing Receivable, Modifications, Recorded Investment, During Period			72
SEPH Commercial Land and Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	0		0
Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment	847,598	[3]		859,753	[3]
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	6		3
Accruing loans past due 30-89 days	317			808
Past due nonaccrual loans and loans past due 90 days or more and accruing	1,818	[1]		8,288	[2]
Total loans past due	2,135			9,096
Total current	1,072,659			1,064,087
Recorded Investment	1,074,794	[3]		1,073,183	[3]
Loans past due 90 days or more and accruing	0
Financing Receivable, Modifications, Recorded Investment, During Period	1,314		684
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	66		71
Accruing loans past due 30-89 days	7,546			11,304
Past due nonaccrual loans and loans past due 90 days or more and accruing	3,133	[1]		3,818	[2]
Total loans past due	10,679			15,122
Total current	904,992			881,005
Recorded Investment	915,671			896,127
Loans past due 90 days or more and accruing	816			1,133
Financing Receivable, Modifications, Recorded Investment, During Period	492		490
Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	0			0
Past due nonaccrual loans and loans past due 90 days or more and accruing	0	[1]		0	[2]
Total loans past due	0			0
Total current	3,242			3,188
Recorded Investment	3,242			3,188
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period	0		4
Accruing Financing Receivable Modifications [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	948		743
Accruing Financing Receivable Modifications [Member] | Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	398
Accruing Financing Receivable Modifications [Member] | Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	0		0
Accruing Financing Receivable Modifications [Member] | Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	0		0
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	328		164
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	193		0
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period			36
Accruing Financing Receivable Modifications [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period			161
Accruing Financing Receivable Modifications [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	29		382
Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	3,222		1,290
Nonaccruing Financing Receivable Modifications [Member] | Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	597		60
Nonaccruing Financing Receivable Modifications [Member] | Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	21
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	513		68
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	206		495
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	108		0
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period			36
Nonaccruing Financing Receivable Modifications [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	1,314		523
Nonaccruing Financing Receivable Modifications [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	$ 463		$ 108

[1] Includes $1.7 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans and accruing troubled debt restructurings.

[2] * Includes $2.7 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans and accruing troubled debt restructurings.

[3] 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.