Loans (Recorded Investment In Nonaccrual Restructured And Loans Past Due 90 Days Or More And Accruing) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 74,478	$ 46,760	$ 74,478	$ 46,760	$ 48,144
Nonaccrual loans	89,555		89,555		67,954
Accruing restructured loans	18,485		18,485		15,222
Loans past due 90 days or more and accruing	3,348		3,348		2,302
Total nonperforming loans	111,388		111,388		85,478
Impaired Financing Receivable, Average Recorded Investment	57,236	54,679	52,490	52,015
Impaired Financing Receivable, Interest Income, Cash Basis Method	412	485	1,142	1,292
Commercial Financial And Agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Impaired Financing Receivable, Recorded Investment	31,485	16,026	31,485	16,026
Nonaccrual loans	28,099		28,099		14,998
Accruing restructured loans	3,430		3,430		196
Loans past due 90 days or more and accruing	0		0		10
Total nonperforming loans	31,529		31,529		15,204
Impaired Financing Receivable, Average Recorded Investment	23,468	23,247	18,368	22,686
Impaired Financing Receivable, Interest Income, Cash Basis Method	107	187	244	506
Construction Real Estate Commercial [Domain]
Financing Receivable, Credit Quality Indicator [Line Items]
Impaired Financing Receivable, Recorded Investment	1,868	2,016	1,868	2,016
Nonaccrual loans	1,786		1,786		1,866
Accruing restructured loans	82		82		0
Loans past due 90 days or more and accruing	235		235		0
Total nonperforming loans	2,103		2,103		1,866
Impaired Financing Receivable, Average Recorded Investment	1,922	2,246	2,176	1,661
Impaired Financing Receivable, Interest Income, Cash Basis Method	1	4	23	31
Construction Real Estate - Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	27		27
Accruing restructured loans	7		7		15
Loans past due 90 days or more and accruing	0		0		20
Total nonperforming loans	34		34		35
Construction Real Estate - Installment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	73		73		19
Accruing restructured loans	6		6		9
Loans past due 90 days or more and accruing	12		12		0
Total nonperforming loans	91		91		28
Residential Real Estate Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Impaired Financing Receivable, Recorded Investment	2,238	2,913	2,238	2,913
Nonaccrual loans	2,224		2,224		2,610
Accruing restructured loans	14		14		122
Loans past due 90 days or more and accruing	0		0
Total nonperforming loans	2,238		2,238		2,732
Impaired Financing Receivable, Average Recorded Investment	1,977	2,758	2,198	6,086
Impaired Financing Receivable, Interest Income, Cash Basis Method	27	26	72	84
Residential Real Estate - Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	15,367		15,367		16,892
Accruing restructured loans	8,821		8,821		9,100
Loans past due 90 days or more and accruing	1,641		1,641		1,124
Total nonperforming loans	25,829		25,829		27,116
Residential Real Estate - HELOC [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	1,700		1,700		2,158
Accruing restructured loans	1,021		1,021		1,028
Loans past due 90 days or more and accruing	56		56		9
Total nonperforming loans	2,777		2,777		3,195
Residential Real Estate - Installment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	512		512		468
Accruing restructured loans	1,915		1,915		1,049
Loans past due 90 days or more and accruing	0		0		24
Total nonperforming loans	2,427		2,427		1,541
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Impaired Financing Receivable, Recorded Investment	38,799	25,805	38,799	25,805
Nonaccrual loans	36,663		36,663		25,566
Accruing restructured loans	2,136		2,136		2,860
Loans past due 90 days or more and accruing	625		625
Total nonperforming loans	39,424		39,424		28,426
Impaired Financing Receivable, Average Recorded Investment	29,779	26,428	29,712	21,582
Impaired Financing Receivable, Interest Income, Cash Basis Method	277	$ 268	803	$ 671
Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	3,016		3,016		3,377
Accruing restructured loans	1,053		1,053		843
Loans past due 90 days or more and accruing	570		570		1,115
Total nonperforming loans	4,639		4,639		5,335
Finance Leases Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	88		88		0
Accruing restructured loans	0		0		0
Loans past due 90 days or more and accruing	209		209		0
Total nonperforming loans	297		297		$ 0
Finance Leases Portfolio Segment [Member] | Residential Real Estate Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Impaired Financing Receivable, Recorded Investment	88		88
Impaired Financing Receivable, Average Recorded Investment	$ 90		$ 36