Loans (Loans Individually And Collectively Evaluated For Impairment) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	$ 146,917	$ 111,378
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	116,180	77,491
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	30,737	33,887
Commercial Financial And Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	33,098	33,125
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	33,098	33,088
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment		37
Construction Real Estate Commercial [Domain]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	3,142	453
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	3,142	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	17	109
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	0	0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	17	109
Construction Real Estate - Installment [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	15	77
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	0	0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	15	77
Residential Real Estate Commercial [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	4,897	2,025
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	4,897	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	23,030	24,097
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	0	0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	23,030	24,097
Residential Real Estate - HELOC [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	2,253	3,072
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	0	0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	2,253	3,072
Residential Real Estate - Installment [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	2,125	2,426
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	0	0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	2,125	2,426
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	72,519	41,791
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	72,519	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	3,297	4,069
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	3,297	4,069
Finance Leases Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	2,524	134
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	$ 2,524	$ 134