Loans And Allowance For Credit Losses (Troubled Debt Restructurings by Type of Modification) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring	$ 87,287	$ 79,450
Performing/Accruing TDR - Commercial [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring	64,369	55,934
Performing/Accruing TDR - Assistance programs [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring	8,590	8,365
Performing/Accruing TDR - Consumer Bankruptcy [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring	3,301	3,592
Performing/Accruing TDR - Other Consumer [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring	3,245	3,621
TDR Non-accrual loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring	$ 7,782	$ 7,938