Loans And Allowance For Loan Losses (Outstanding Balance Of Loans Classified As Troubled Debt Restructurings) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 106,222	$ 110,608
Balance 90 days past due at any time during previous 12 months	1,000
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	79,963
Balance 90 days past due at any time during previous 12 months	28
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	408
Balance 90 days past due at any time during previous 12 months	0
Commercial Portfolio Segment [Member] | Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	9,045
Balance 90 days past due at any time during previous 12 months	0
Personal Banking Portfolio Segment [Member] | Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	4,342
Balance 90 days past due at any time during previous 12 months	292
Personal Banking Portfolio Segment [Member] | Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	5,309
Balance 90 days past due at any time during previous 12 months	89
Personal Banking Portfolio Segment [Member] | Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	68
Balance 90 days past due at any time during previous 12 months	0
Personal Banking Portfolio Segment [Member] | Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,087
Balance 90 days past due at any time during previous 12 months	$ 591