Loans (Recorded Investment In Nonaccrual Restructured And Loans Past Due 90 Days Or More And Accruing) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	$ 90,354	$ 90,080
Accruing restructured loans	27,418	21,298
Loans past due 90 days or more and accruing	1,855	2,737
Total nonperforming loans	119,627	114,115
Commercial Financial And Agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	21,330	26,776
Accruing restructured loans	8,224	6,349
Loans past due 90 days or more and accruing	18	28
Total nonperforming loans	29,572	33,153
Construction Real Estate Commercial [Domain]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	452	453
Accruing restructured loans	0	0
Loans past due 90 days or more and accruing	0	0
Total nonperforming loans	452	453
Construction Real Estate - Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	18	25
Accruing restructured loans	95	84
Loans past due 90 days or more and accruing	0	0
Total nonperforming loans	113	109
Construction Real Estate - Installment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	0	72
Accruing restructured loans	18	5
Loans past due 90 days or more and accruing	0	0
Total nonperforming loans	18	77
Residential Real Estate Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	5,581	2,025
Accruing restructured loans	0	0
Loans past due 90 days or more and accruing	0
Total nonperforming loans	5,581	2,025
Residential Real Estate - Mortgage [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	14,383	15,271
Accruing restructured loans	8,806	8,826
Loans past due 90 days or more and accruing	636	1,209
Total nonperforming loans	23,825	25,306
Residential Real Estate - HELOC [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	1,600	2,062
Accruing restructured loans	997	1,010
Loans past due 90 days or more and accruing	6	44
Total nonperforming loans	2,603	3,116
Residential Real Estate - Installment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	367	462
Accruing restructured loans	2,005	1,964
Loans past due 90 days or more and accruing	4
Total nonperforming loans	2,376	2,426
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	43,950	39,711
Accruing restructured loans	6,197	2,080
Loans past due 90 days or more and accruing	638	625
Total nonperforming loans	50,785	42,416
Consumer [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	2,544	3,089
Accruing restructured loans	1,076	980
Loans past due 90 days or more and accruing	366	645
Total nonperforming loans	3,986	4,714
Finance Leases Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Nonaccrual loans	129	134
Accruing restructured loans	0	0
Loans past due 90 days or more and accruing	187	186
Total nonperforming loans	$ 316	$ 320