Loans And Allowance For Loan Losses (Outstanding Balance Of Loans Classified As Troubled Debt Restructurings) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 100,869	$ 110,608
Balance 90 days past due at any time during previous 12 months	2,655
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	69,156
Balance 90 days past due at any time during previous 12 months	43
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,399
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	10,546
Balance 90 days past due at any time during previous 12 months	1,299
Personal Banking Portfolio Segment [Member] | Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,476
Balance 90 days past due at any time during previous 12 months	389
Personal Banking Portfolio Segment [Member] | Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	5,469
Balance 90 days past due at any time during previous 12 months	106
Personal Banking Portfolio Segment [Member] | Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	152
Balance 90 days past due at any time during previous 12 months	74
Personal Banking Portfolio Segment [Member] | Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Modifications, Recorded Investment	6,671
Balance 90 days past due at any time during previous 12 months	$ 744