Loans (Aging Of Recorded Investment In Past Due Loans) (Details) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2015 USD ($) contracts		Sep. 30, 2014 USD ($) contracts	Sep. 30, 2015 USD ($) contracts		Sep. 30, 2014 USD ($) contracts	Dec. 31, 2014 USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		91		121	322		331
Accruing loans past due 30-89 days		$ 22,401			$ 22,401			$ 31,074
Past due nonaccrual loans and loans past due 90 days or more and accruing		38,012	[1]		38,012	[1]		52,932	[2]
Total loans past due		60,413			60,413			84,006
Total current		4,954,151			4,954,151			4,759,305
Recorded Investment		5,014,564			5,014,564			4,843,311
Loans past due 90 days or more and accruing		1,555			1,555			2,709
Financing Receivable, Modifications, Recorded Investment, During Period		$ 7,233		$ 4,529	$ 12,993		$ 6,853
Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		8		14	33		24
Accruing loans past due 30-89 days		$ 213			$ 213			6,482
Past due nonaccrual loans and loans past due 90 days or more and accruing		3,619	[1]		3,619	[1]		7,508	[2]
Total loans past due		3,832			3,832			13,990
Total current		908,671			908,671			845,763
Loans past due 90 days or more and accruing		0			0			229
Financing Receivable, Modifications, Recorded Investment, During Period		4,063		$ 1,801	6,182		$ 1,841
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			0
Past due nonaccrual loans and loans past due 90 days or more and accruing		2,043	[1]		2,043	[1]		2,068	[2]
Total loans past due		2,043			2,043			2,068
Total current		26			26			127
Recorded Investment	[3]	2,069			2,069			2,195
Loans past due 90 days or more and accruing		$ 0			$ 0			0
Construction Real Estate - Remaining Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		1		0	1		2
Accruing loans past due 30-89 days		$ 40			$ 40			166
Past due nonaccrual loans and loans past due 90 days or more and accruing		84	[1]		84	[1]		77	[2]
Total loans past due		124			124			243
Total current		116,142			116,142			115,196
Recorded Investment		116,266			116,266			115,439
Loans past due 90 days or more and accruing		0			0			0
Financing Receivable, Modifications, Recorded Investment, During Period		$ 196			$ 196		$ 207
Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		0		0	1		0
Accruing loans past due 30-89 days		$ 77			$ 77			39
Past due nonaccrual loans and loans past due 90 days or more and accruing		8	[1]		8	[1]		68	[2]
Total loans past due		85			85			107
Total current		35,547			35,547			31,113
Recorded Investment		35,632			35,632			31,220
Loans past due 90 days or more and accruing		$ 0			0			9
Financing Receivable, Modifications, Recorded Investment, During Period					$ 20
Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		0		0	0		0
Accruing loans past due 30-89 days		$ 81			$ 81			21
Past due nonaccrual loans and loans past due 90 days or more and accruing		78	[1]		78	[1]		25	[2]
Total loans past due		159			159			46
Total current		6,622			6,622			7,299
Recorded Investment		6,781			6,781			7,345
Loans past due 90 days or more and accruing		$ 0			$ 0			0
Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		1		2	10		4
Accruing loans past due 30-89 days		$ 257			$ 257			250
Past due nonaccrual loans and loans past due 90 days or more and accruing		18,292	[1]		18,292	[1]		19,592	[2]
Total loans past due		18,549			18,549			19,842
Total current		394,628			394,628			398,808
Recorded Investment		413,177			413,177			418,650
Loans past due 90 days or more and accruing		0			0
Financing Receivable, Modifications, Recorded Investment, During Period		$ 200		$ 312	$ 1,344		$ 333
Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		9		11	24		31
Accruing loans past due 30-89 days		$ 10,064			$ 10,064			11,146
Past due nonaccrual loans and loans past due 90 days or more and accruing		9,295	[1]		9,295	[1]		10,637	[2]
Total loans past due		19,359			19,359			21,783
Total current		1,198,702			1,198,702			1,169,474
Recorded Investment		1,218,061			1,218,061			1,191,257
Loans past due 90 days or more and accruing		469			469			1,329
Financing Receivable, Modifications, Recorded Investment, During Period		$ 748		$ 864	$ 1,524		$ 1,853
Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		5		2	21		7
Accruing loans past due 30-89 days		$ 796			$ 796			262
Past due nonaccrual loans and loans past due 90 days or more and accruing		153	[1]		153	[1]		387	[2]
Total loans past due		949			949			649
Total current		213,294			213,294			217,069
Recorded Investment		214,243			214,243			217,718
Loans past due 90 days or more and accruing		17			17			9
Financing Receivable, Modifications, Recorded Investment, During Period		47		$ 29	347		$ 288
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		240			240			596
Past due nonaccrual loans and loans past due 90 days or more and accruing		535	[1]		535	[1]		464	[2]
Total loans past due		775			775			1,060
Total current		23,601			23,601			26,176
Recorded Investment		24,376			24,376			27,236
Loans past due 90 days or more and accruing		4			4
Financing Receivable, Modifications, Recorded Investment, During Period		$ 4		$ 142	$ 36		$ 240
SEPH Commercial Land and Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		0		0	0		0
Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment	[3]	$ 912,503			$ 912,503			859,753
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		5		2	11		8
Accruing loans past due 30-89 days		$ 917			$ 917			808
Past due nonaccrual loans and loans past due 90 days or more and accruing		796	[1]		796	[1]		8,288	[2]
Total loans past due		1,713			1,713			9,096
Total current		1,094,104			1,094,104			1,064,087
Recorded Investment	[3]	1,095,817			1,095,817			1,073,183
Loans past due 90 days or more and accruing		0			0
Financing Receivable, Modifications, Recorded Investment, During Period		$ 1,512		$ 622	$ 2,525		$ 905
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		61		87	217		246
Accruing loans past due 30-89 days		$ 9,716			$ 9,716			11,304
Past due nonaccrual loans and loans past due 90 days or more and accruing		3,109	[1]		3,109	[1]		3,818	[2]
Total loans past due		12,825			12,825			15,122
Total current		959,710			959,710			881,005
Recorded Investment		972,535			972,535			896,127
Loans past due 90 days or more and accruing		1,065			1,065			1,133
Financing Receivable, Modifications, Recorded Investment, During Period		463		$ 759	819		$ 1,186
Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		0			0			0
Past due nonaccrual loans and loans past due 90 days or more and accruing		0	[1]		0	[1]		0	[2]
Total loans past due		0			0			0
Total current		3,104			3,104			3,188
Recorded Investment		$ 3,104			$ 3,104			$ 3,188
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		1		3	4		9
Accruing Financing Receivable Modifications [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		$ 708		$ 1,832	$ 2,048		$ 2,572
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		245		776	1,014		776
Accruing Financing Receivable Modifications [Member] | Construction Real Estate - Remaining Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		196			196
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	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	0		0
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		200			200
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		0		508	325		749
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		16		0	242		93
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				133			228
Accruing Financing Receivable Modifications [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		51		415	71		726
Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		6,525		2,697	10,945		4,281
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		3,818		1,025	5,168		1,065
Nonaccruing Financing Receivable Modifications [Member] | Construction Real Estate - Remaining Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period							207
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					20
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				312	1,144		333
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		748		356	1,199		1,104
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		31		29	105		195
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		4		9	36		12
Nonaccruing Financing Receivable Modifications [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		1,512		622	2,525		905
Nonaccruing Financing Receivable Modifications [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		$ 412		$ 344	$ 748		$ 460

[1] Includes $1.6 million of loans past due 90 days or more and accruing. The remaining are past due nonaccrual loans.

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

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