Allowance For Loan Losses (Activity In The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan and Lease Losses, Reserve Estimate Methodology, Historical Loss Period Factor					108 months	96 months
Financing Receivable, Allowance for Credit Loss, Writeoff	$ 2,479	$ 3,474	$ 8,394	$ 9,640
Financing Receivable, Allowance for Credit Loss, Recovery	2,362	1,328	6,351	5,312
Financing Receivables Allowance For Credit Losses Net Charge Offs	117	2,146	2,043	4,328
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	54,003	49,452	51,512	49,988	$ 49,988
Ending balance	55,853	50,246	55,853	50,246	51,512	$ 49,988
Provision for Loan, Lease, and Other Losses	1,967	2,940	6,384	4,586
Commercial Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	585	993	1,498	1,929
Financing Receivable, Allowance for Credit Loss, Recovery	403	136	983	994
Financing Receivables Allowance For Credit Losses Net Charge Offs	182	857	515	935
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	17,370	14,478	16,777	15,022	15,022
Ending balance	18,426	15,015	18,426	15,015	16,777	15,022
Provision for Loan, Lease, and Other Losses	1,238	1,394	2,164	928
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	8	23	401	252
Financing Receivable, Allowance for Credit Loss, Recovery	246	27	360	203
Financing Receivables Allowance For Credit Losses Net Charge Offs	(238)	(4)	41	49
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,377	9,406	9,768	9,601	9,601
Ending balance	10,438	9,747	10,438	9,747	9,768	9,601
Provision for Loan, Lease, and Other Losses	(177)	337	711	195
Construction Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	0	26	0	57
Financing Receivable, Allowance for Credit Loss, Recovery	432	156	543	435
Financing Receivables Allowance For Credit Losses Net Charge Offs	(432)	(130)	(543)	(378)
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,065	4,652	4,463	4,430	4,430
Ending balance	5,432	4,595	5,432	4,595	4,463	4,430
Provision for Loan, Lease, and Other Losses	(65)	(187)	426	(213)
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	85	61	176	279
Financing Receivable, Allowance for Credit Loss, Recovery	98	130	640	734
Financing Receivables Allowance For Credit Losses Net Charge Offs	(13)	(69)	(464)	(455)
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	8,869	9,245	8,731	9,321	9,321
Ending balance	8,931	9,102	8,931	9,102	8,731	9,321
Provision for Loan, Lease, and Other Losses	49	(212)	(264)	(674)
Consumer [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	1,801	2,371	6,319	7,123
Financing Receivable, Allowance for Credit Loss, Recovery	1,183	875	3,824	2,942
Financing Receivables Allowance For Credit Losses Net Charge Offs	618	1,496	2,495	4,181
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	12,265	11,671	11,773	11,614	11,614
Ending balance	12,555	11,787	12,555	11,787	11,773	11,614
Provision for Loan, Lease, and Other Losses	908	1,612	3,277	4,354
Finance Leases Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0	0	0
Financing Receivable, Allowance for Credit Loss, Recovery	0	4	1	4
Financing Receivables Allowance For Credit Losses Net Charge Offs	0	(4)	(1)	(4)
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	57	0	0	0	0
Ending balance	71	0	71	0	$ 0	$ 0
Provision for Loan, Lease, and Other Losses	$ 14	$ (4)	$ 70	$ (4)