Loans (Aging Of Recorded Investment In Past Due Loans) (Details) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2016 USD ($) contracts		Sep. 30, 2015 USD ($) contracts	Sep. 30, 2016 USD ($) contracts		Sep. 30, 2015 USD ($) contracts	Dec. 31, 2015 USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		115		91	309		322
Accruing loans past due 30-89 days		$ 21,443			$ 21,443			$ 24,505
Past due nonaccrual loans and loans past due 90 days or more and accruing		26,116	[1]		26,116	[1]		42,383	[2]
Total loans past due		47,559			47,559			66,888
Total current		5,154,020			5,154,020			5,015,436
Recorded Investment		5,201,579			5,201,579			5,082,324
Loans past due 90 days or more and accruing		1,723			1,723			1,975
Impaired Financing Receivable, Recorded Investment, Nonaccrual loans which are current in regards to contractual P&I payments		73,400			73,400			55,500
Financing Receivable, Modifications, Recorded Investment, During Period		$ 12,422		$ 7,233	$ 18,779		$ 12,993
Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		12		8	29		33
Accruing loans past due 30-89 days		$ 1,368			$ 1,368			670
Past due nonaccrual loans and loans past due 90 days or more and accruing		4,071	[1]		4,071	[1]		7,536	[2]
Total loans past due		5,439			5,439			8,206
Total current		956,376			956,376			950,958
Loans past due 90 days or more and accruing		0			0
Financing Receivable, Modifications, Recorded Investment, During Period		6,603		$ 4,063	7,344		$ 6,182
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		1,700	[1]		1,700	[1]		2,044	[2]
Total loans past due		1,700			1,700			2,044
Recorded Investment	[3]	1,700			1,700			2,044
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		1	2		1
Accruing loans past due 30-89 days								165
Past due nonaccrual loans and loans past due 90 days or more and accruing		$ 79	[1]		$ 79	[1]		84	[2]
Total loans past due		79			79			249
Total current		137,120			137,120			128,118
Recorded Investment		137,199			137,199			128,367
Loans past due 90 days or more and accruing		0			0			0
Financing Receivable, Modifications, Recorded Investment, During Period		$ 947		$ 196	$ 1,144		$ 196
Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		0		0	0		1
Accruing loans past due 30-89 days		$ 45			$ 45			63
Past due nonaccrual loans and loans past due 90 days or more and accruing	[2]							7
Total loans past due		45			45			70
Total current		41,891			41,891			36,727
Recorded Investment		41,936			41,936			36,797
Loans past due 90 days or more and accruing		$ 0			$ 0			0
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	1		0
Accruing loans past due 30-89 days		$ 93			$ 93			200
Past due nonaccrual loans and loans past due 90 days or more and accruing	[2]							46
Total loans past due		93			93			246
Total current		5,469			5,469			6,308
Recorded Investment		5,562			5,562			6,554
Loans past due 90 days or more and accruing		$ 0			0			0
Financing Receivable, Modifications, Recorded Investment, During Period					$ 9
Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		4		1	7		10
Accruing loans past due 30-89 days		$ 120			$ 120			325
Past due nonaccrual loans and loans past due 90 days or more and accruing		3,878	[1]		3,878	[1]		19,521	[2]
Total loans past due		3,998			3,998			19,846
Total current		405,299			405,299			391,739
Recorded Investment		409,297			409,297			411,585
Loans past due 90 days or more and accruing		0			0
Financing Receivable, Modifications, Recorded Investment, During Period		$ 225		$ 200	$ 918		$ 1,344
Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		14		9	23		24
Accruing loans past due 30-89 days		$ 8,753			$ 8,753			10,569
Past due nonaccrual loans and loans past due 90 days or more and accruing		9,637	[1]		9,637	[1]		8,735	[2]
Total loans past due		18,390			18,390			19,304
Total current		1,172,224			1,172,224			1,192,984
Recorded Investment		1,190,614			1,190,614			1,212,288
Loans past due 90 days or more and accruing		750			750			851
Financing Receivable, Modifications, Recorded Investment, During Period		$ 1,173		$ 748	$ 1,809		$ 1,524
Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		2		5	10		21
Accruing loans past due 30-89 days		$ 277			$ 277			487
Past due nonaccrual loans and loans past due 90 days or more and accruing		1,190	[1]		1,190	[1]		186	[2]
Total loans past due		1,467			1,467			673
Total current		212,289			212,289			211,511
Recorded Investment		213,756			213,756			212,184
Loans past due 90 days or more and accruing		51			51			27
Financing Receivable, Modifications, Recorded Investment, During Period		91		$ 47	201		$ 347
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		293			293			426
Past due nonaccrual loans and loans past due 90 days or more and accruing		882	[1]		882	[1]		318	[2]
Total loans past due		1,175			1,175			744
Total current		18,371			18,371			21,972
Recorded Investment		19,546			19,546			22,716
Loans past due 90 days or more and accruing		25			25			4
Financing Receivable, Modifications, Recorded Investment, During Period		$ 37		$ 4	$ 79		$ 36
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]	$ 961,815			$ 961,815			959,164
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		6		5	10		11
Accruing loans past due 30-89 days		$ 448			$ 448			142
Past due nonaccrual loans and loans past due 90 days or more and accruing		2,724	[1]		2,724	[1]		530	[2]
Total loans past due		3,172			3,172			672
Total current		1,142,098			1,142,098			1,116,940
Recorded Investment	[3]	1,145,270			1,145,270			1,117,612
Loans past due 90 days or more and accruing		0			0
Financing Receivable, Modifications, Recorded Investment, During Period		$ 1,777		$ 1,512	$ 5,118		$ 2,525
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		74		61	223		217
Accruing loans past due 30-89 days		$ 10,046			$ 10,046			11,458
Past due nonaccrual loans and loans past due 90 days or more and accruing		1,955	[1]		1,955	[1]		3,376	[2]
Total loans past due		12,001			12,001			14,834
Total current		1,059,226			1,059,226			955,309
Recorded Investment		1,071,227			1,071,227			970,143
Loans past due 90 days or more and accruing		897			897			1,093
Financing Receivable, Modifications, Recorded Investment, During Period		1,569		$ 463	2,157		$ 819
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		3,657			3,657			2,870
Recorded Investment		$ 3,657			$ 3,657			$ 2,870
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Number of Contracts, During Period | contracts		2		1	4		4
Accruing Financing Receivable Modifications [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		$ 246		$ 708	$ 3,214		$ 2,048
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		152		245	102		1,014
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		0	96		325
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		0		16	17		242
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		33			72
Accruing Financing Receivable Modifications [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period					2,812
Accruing Financing Receivable Modifications [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		61		51	115		71
Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		12,176		6,525	15,565		10,945
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		6,451		3,818	7,242		5,168
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		947			1,144
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] | Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period					9
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		225			918		1,144
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		1,173		748	1,713		1,199
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		91		31	184		105
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		4	7		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		1,777		1,512	2,306		2,525
Nonaccruing Financing Receivable Modifications [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		$ 1,508		$ 412	$ 2,042		$ 748

[1] 1) Includes $1.7 million of loans past due 90 days or more and accruing. The remaining are past due nonaccrual loans.(2) Includes $73.4 million of nonaccrual loans which are current in regards to contractual principal and interest payments

[2] 1) Includes $2.0 million of loans past due 90 days or more and accruing. The remaining are past due nonaccrual loans.(2) Includes $55.5 million of nonaccrual loans which are current in regards to contractual principal and interest payments.

[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.