Loans (Recorded Investment In Financing Receivable Modified As TDR Within 12 Months) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) contracts	Jun. 30, 2017 USD ($) contracts	Jun. 30, 2018 USD ($) contracts	Jun. 30, 2017 USD ($) contracts	Dec. 31, 2017 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Troubled Debt Restructuring, Classification removed	$ 1,900		$ 2,200	$ 0
Number of Contracts | contracts	52	70	58	79
Recorded Investment	$ 1,235	$ 2,110	$ 1,380	$ 2,326
Financing Receivable, Modifications, Recorded Investment, During Period	2,374	$ 3,036	3,767	$ 7,569
Troubled Debt Restructuring Included In Nonaccrual Loans	23,900		23,900		$ 38,500
Nonaccrual Trouble Debt Restructuring Current	18,100		18,100		$ 32,400
Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	$ 14		$ 14
Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	3	4	3	4
Recorded Investment	$ 144	$ 109	$ 144	$ 109
Financing Receivable, Modifications, Recorded Investment, During Period	$ 149	$ 164	$ 193	$ 3,052
Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	1	0	1
Recorded Investment		$ 29		$ 29
Financing Receivable, Modifications, Recorded Investment, During Period		$ 282		$ 282
Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	6	10	7	10
Recorded Investment	$ 600	$ 724	$ 703	$ 724
Financing Receivable, Modifications, Recorded Investment, During Period	$ 317	$ 944	$ 961	$ 1,548
Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	1	2	1	2
Recorded Investment	$ 88	$ 10	$ 88	$ 10
Financing Receivable, Modifications, Recorded Investment, During Period	452	208	791	406
Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		8		8
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	$ 75	$ 40	$ 121	$ 73
Construction Real Estate Commercial [Domain]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	0	0	0
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	$ 778	$ 588	$ 967	$ 1,017
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	4	0	5
Recorded Investment		$ 657		$ 834
Financing Receivable, Modifications, Recorded Investment, During Period	$ 589	$ 802	$ 720	$ 1,183
Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	1	0	1
Recorded Investment	$ 0	$ 2	$ 0	$ 2
Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	42	48	47	56
Recorded Investment	$ 403	$ 579	$ 445	$ 618
Finance Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Accruing Financing Receivable Modifications [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	1,223	1,477	1,511	1,725
Accruing Financing Receivable Modifications [Member] | Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	14	0	14	0
Accruing Financing Receivable Modifications [Member] | Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	123		123
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	93	438	93	438
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	409	160	661	359
Accruing Financing Receivable Modifications [Member] | Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	0	0	0	0
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	71	40	104	73
Accruing Financing Receivable Modifications [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	58	37	61	52
Accruing Financing Receivable Modifications [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	455	802	455	803
Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	1,151	1,559	2,256	5,844
Nonaccruing Financing Receivable Modifications [Member] | Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	26	164	70	3,052
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		282		282
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	224	506	868	1,110
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	43	48	130	47
Nonaccruing Financing Receivable Modifications [Member] | Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		8		8
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	4		17
Nonaccruing Financing Receivable Modifications [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	720	$ 551	906	965
Nonaccruing Financing Receivable Modifications [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	$ 134		$ 265	$ 380