Loans And Allowance For Credit Losses (Outstanding Balance Of Loans Classified As Troubled Debt Restructurings) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Troubled Debt Restructuring	$ 87,287	$ 79,450
Balance 90 days past due at any time during previous 12 months	1,347
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Troubled Debt Restructuring	43,793
Balance 90 days past due at any time during previous 12 months	0
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Troubled Debt Restructuring	43
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, Troubled Debt Restructuring	27,448
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, Troubled Debt Restructuring	3,816
Balance 90 days past due at any time during previous 12 months	209
Personal Banking Portfolio Segment [Member] | Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Troubled Debt Restructuring	3,858
Balance 90 days past due at any time during previous 12 months	79
Personal Banking Portfolio Segment [Member] | Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Troubled Debt Restructuring	33
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, Troubled Debt Restructuring	8,296
Balance 90 days past due at any time during previous 12 months	$ 1,059