Loans And Allowance For Credit Losses (Outstanding Balance Of Loans Classified As Troubled Debt Restructurings) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Troubled Debt Restructuring	$ 73,161	$ 79,450
Balance 90 days past due at any time during previous 12 months	1,286
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Troubled Debt Restructuring	17,696
Balance 90 days past due at any time during previous 12 months	674
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Troubled Debt Restructuring	41
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	40,596
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	3,278
Balance 90 days past due at any time during previous 12 months	252
Personal Banking Portfolio Segment [Member] | Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Troubled Debt Restructuring	3,530
Balance 90 days past due at any time during previous 12 months	103
Personal Banking Portfolio Segment [Member] | Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Troubled Debt Restructuring	56
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	7,964
Balance 90 days past due at any time during previous 12 months	$ 257