Loans (Loans Individually And Collectively Evaluated For Impairment) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	$ 117,772	$ 111,378
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	85,851	77,491
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	31,921	33,887
Commercial Financial And Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	29,554	33,125
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	29,542	33,088
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	12	37
Construction Real Estate Commercial [Domain]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	452	453
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	452	453
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	0	0
Construction Real Estate - Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	113	109
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	0	0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	113	109
Construction Real Estate - Installment [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	18	77
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	0	0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	18	77
Residential Real Estate Commercial [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	5,581	2,025
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	5,581	2,025
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	0	0
Residential Real Estate - Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	23,189	24,097
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	0	0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	23,189	24,097
Residential Real Estate - HELOC [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	2,597	3,072
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	0	0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	2,597	3,072
Residential Real Estate - Installment [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	2,372	2,426
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	0	0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	2,372	2,426
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	50,147	41,791
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	50,147	41,791
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	0	0
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	3,620	4,069
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	3,620	4,069
Finance Leases Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	129	134
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	$ 129	$ 134