Loans (Recorded Investment In Nonaccrual Restructured And Loans Past Due 90 Days Or More And Accruing) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	$ 123,050	$ 90,080
Accruing restructured loans	23,867	21,298
Loans past due 90 days or more and accruing	1,703	2,737
Total nonperforming loans	148,620	114,115
Commercial Financial And Agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	25,582	26,776
Accruing restructured loans	7,516	6,349
Loans past due 90 days or more and accruing	63	28
Total nonperforming loans	33,161	33,153
Construction Real Estate Commercial [Domain]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	3,142	453
Accruing restructured loans	0	0
Loans past due 90 days or more and accruing	0	0
Total nonperforming loans	3,142	453
Construction Real Estate - Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	0	25
Accruing restructured loans	17	84
Loans past due 90 days or more and accruing	0	0
Total nonperforming loans	17	109
Construction Real Estate - Installment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	14	72
Accruing restructured loans	1	5
Loans past due 90 days or more and accruing	0	0
Total nonperforming loans	15	77
Residential Real Estate Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	4,862	2,025
Accruing restructured loans	35	0
Loans past due 90 days or more and accruing	0
Total nonperforming loans	4,897	2,025
Residential Real Estate - Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	14,933	15,271
Accruing restructured loans	8,097	8,826
Loans past due 90 days or more and accruing	476	1,209
Total nonperforming loans	23,506	25,306
Residential Real Estate - HELOC [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	1,358	2,062
Accruing restructured loans	895	1,010
Loans past due 90 days or more and accruing	65	44
Total nonperforming loans	2,318	3,116
Residential Real Estate - Installment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	312	462
Accruing restructured loans	1,813	1,964
Loans past due 90 days or more and accruing	0
Total nonperforming loans	2,125	2,426
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	68,134	39,711
Accruing restructured loans	4,385	2,080
Loans past due 90 days or more and accruing	654	625
Total nonperforming loans	73,173	42,416
Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	2,189	3,089
Accruing restructured loans	1,108	980
Loans past due 90 days or more and accruing	445	645
Total nonperforming loans	3,742	4,714
Finance Leases Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	2,524	134
Accruing restructured loans	0	0
Loans past due 90 days or more and accruing	0	186
Total nonperforming loans	$ 2,524	$ 320