Loans And Allowance For Credit Losses (Troubled Debt Restructurings by Type of Modification) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled Debt Restructurings	$ 129,858	$ 140,627
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled Debt Restructurings	110,583	117,740
Assistance programs
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled Debt Restructurings	6,789	7,804
Consumer bankruptcy
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled Debt Restructurings	2,327	2,841
Other consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled Debt Restructurings	2,293	2,353
Non-accrual loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Troubled Debt Restructurings	$ 7,866	$ 9,889