Loans (Aging Of Recorded Investment In Past Due Loans) (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2016 USD ($) contracts		Mar. 31, 2015 USD ($) contracts	Dec. 31, 2015 USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		84		106
Accruing loans past due 30-89 days		$ 19,989			$ 24,505
Past due nonaccrual loans and loans past due 90 days or more and accruing		35,623	[1]		42,383	[2]
Total loans past due		55,612			66,888
Total current		5,020,773			5,015,436
Recorded Investment		5,076,385			5,082,324
Loans past due 90 days or more and accruing		1,370			1,975
Financing Receivable, Modifications, Recorded Investment, During Period		$ 2,529		$ 4,170
Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		7		13
Accruing loans past due 30-89 days		$ 177			670
Past due nonaccrual loans and loans past due 90 days or more and accruing		7,926	[1]		7,536	[2]
Total loans past due		8,103			8,206
Total current		936,970			950,958
Loans past due 90 days or more and accruing		8
Financing Receivable, Modifications, Recorded Investment, During Period		847		$ 995
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		2,043	[1]		2,044	[2]
Total loans past due		2,043			2,044
Recorded Investment	[3]	2,043			2,044
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 | contracts		0		0
Accruing loans past due 30-89 days					165
Past due nonaccrual loans and loans past due 90 days or more and accruing		$ 139	[1]		84	[2]
Total loans past due		139			249
Total current		129,349			128,118
Recorded Investment		129,488			128,367
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 | contracts		0		1
Accruing loans past due 30-89 days		$ 52			63
Past due nonaccrual loans and loans past due 90 days or more and accruing	[2]				7
Total loans past due		52			70
Total current		37,317			36,727
Recorded Investment		37,369			36,797
Loans past due 90 days or more and accruing		$ 0			0
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 | contracts		0		0
Accruing loans past due 30-89 days		$ 158			200
Past due nonaccrual loans and loans past due 90 days or more and accruing		18	[1]		46	[2]
Total loans past due		176			246
Total current		5,785			6,308
Recorded Investment		5,961			6,554
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 | contracts		2		3
Accruing loans past due 30-89 days		$ 498			325
Past due nonaccrual loans and loans past due 90 days or more and accruing		10,296	[1]		19,521	[2]
Total loans past due		10,794			19,846
Total current		401,527			391,739
Recorded Investment		412,321			411,585
Loans past due 90 days or more and accruing		0
Financing Receivable, Modifications, Recorded Investment, During Period		$ 617		$ 513
Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		5		7
Accruing loans past due 30-89 days		$ 10,369			10,569
Past due nonaccrual loans and loans past due 90 days or more and accruing		9,857	[1]		8,735	[2]
Total loans past due		20,226			19,304
Total current		1,188,903			1,192,984
Recorded Investment		1,209,129			1,212,288
Loans past due 90 days or more and accruing		536			851
Financing Receivable, Modifications, Recorded Investment, During Period		$ 316		$ 534
Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		6		10
Accruing loans past due 30-89 days		$ 521			487
Past due nonaccrual loans and loans past due 90 days or more and accruing		669	[1]		186	[2]
Total loans past due		1,190			673
Total current		208,854			211,511
Recorded Investment		210,044			212,184
Loans past due 90 days or more and accruing		8			27
Financing Receivable, Modifications, Recorded Investment, During Period		186		$ 301
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		292			426
Past due nonaccrual loans and loans past due 90 days or more and accruing		181	[1]		318	[2]
Total loans past due		473			744
Total current		21,343			21,972
Recorded Investment		21,816			22,716
Loans past due 90 days or more and accruing		$ 0			4
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
Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment	[3]	$ 945,073			959,164
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		0		6
Accruing loans past due 30-89 days		$ 570			142
Past due nonaccrual loans and loans past due 90 days or more and accruing		1,853	[1]		530	[2]
Total loans past due		2,423			672
Total current		1,115,855			1,116,940
Recorded Investment	[3]	1,118,278			1,117,612
Loans past due 90 days or more and accruing		$ 0
Financing Receivable, Modifications, Recorded Investment, During Period				$ 1,314
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		64		66
Accruing loans past due 30-89 days		$ 7,352			11,458
Past due nonaccrual loans and loans past due 90 days or more and accruing		2,641	[1]		3,376	[2]
Total loans past due		9,993			14,834
Total current		972,014			955,309
Recorded Investment		982,007			970,143
Loans past due 90 days or more and accruing		818			1,093
Financing Receivable, Modifications, Recorded Investment, During Period		563		$ 492
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		2,856			2,870
Recorded Investment		$ 2,856			$ 2,870
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		0		0
Accruing Financing Receivable Modifications [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		$ 346		$ 948
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		131		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		99		328
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		64		193
Accruing Financing Receivable Modifications [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		52		29
Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		2,183		3,222
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		716		597
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		617		513
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		217		206
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		122		108
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
Nonaccruing Financing Receivable Modifications [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		$ 511		$ 463

[1] Includes $1.4 million of loans past due 90 days or more and accruing. The remaining are past due nonaccrual loans.

[2] * Includes $2.0 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.