Loans (Recorded Investment In Nonaccrual Restructured And Loans Past Due 90 Days Or More And Accruing) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	$ 100,406	$ 90,080
Accruing restructured loans	24,057	21,298
Loans past due 90 days or more and accruing	1,763	2,737
Total nonperforming loans	126,226	114,115
Commercial Financial And Agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	21,897	26,776
Accruing restructured loans	8,297	6,349
Loans past due 90 days or more and accruing	0	28
Total nonperforming loans	30,194	33,153
Construction Real Estate Commercial [Domain]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	631	453
Accruing restructured loans	0	0
Loans past due 90 days or more and accruing	0	0
Total nonperforming loans	631	453
Construction Real Estate - Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	520	25
Accruing restructured loans	17	84
Loans past due 90 days or more and accruing	0	0
Total nonperforming loans	537	109
Construction Real Estate - Installment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	0	72
Accruing restructured loans	16	5
Loans past due 90 days or more and accruing	0	0
Total nonperforming loans	16	77
Residential Real Estate Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	5,257	2,025
Accruing restructured loans	0	0
Loans past due 90 days or more and accruing	0
Total nonperforming loans	5,257	2,025
Residential Real Estate - Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	15,415	15,271
Accruing restructured loans	8,406	8,826
Loans past due 90 days or more and accruing	784	1,209
Total nonperforming loans	24,605	25,306
Residential Real Estate - HELOC [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	1,790	2,062
Accruing restructured loans	869	1,010
Loans past due 90 days or more and accruing	14	44
Total nonperforming loans	2,673	3,116
Residential Real Estate - Installment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	435	462
Accruing restructured loans	1,897	1,964
Loans past due 90 days or more and accruing	0
Total nonperforming loans	2,332	2,426
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	50,490	39,711
Accruing restructured loans	3,581	2,080
Loans past due 90 days or more and accruing	645	625
Total nonperforming loans	54,716	42,416
Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	2,330	3,089
Accruing restructured loans	974	980
Loans past due 90 days or more and accruing	320	645
Total nonperforming loans	3,624	4,714
Finance Leases Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	1,641	134
Accruing restructured loans	0	0
Loans past due 90 days or more and accruing	0	186
Total nonperforming loans	$ 1,641	$ 320