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Allowance For Credit Losses (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
contract
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
contract
Financing Receivable, Impaired [Line Items]          
Threshold Period for Discontinuance of Interest Accrual     90 days 90 days  
Financing Receivable, Nonaccrual, Interest Income $ 100 $ 100 $ 100 $ 100  
Financing Receivable, Threshold Period Past Due 30 days   30 days   30 days
Increase in provision for credit losses for TDRs     $ 100 100  
Charge-offs related to TDRs     $ 200 200 $ 700
Number of TDRs that defaulted | contract     0   1
Financing Receivable, Troubled Debt Restructuring $ 27,652   $ 27,652   $ 29,630
Allowance for credit losses allocated to troubled debt 1,600   1,600   800
Commitment to lend to troubled debt 400   400    
TDRs, subsequent default         $ 3,000
Impaired Financing Receivable, Interest Income, Interest Forgone [Line Items] 200 $ 200 300 $ 300  
Payment Deferral | COVID-19 | Consumer Borrower          
Financing Receivable, Impaired [Line Items]          
Loan Restructuring, Trial Modifications, Amount     135,000    
Financing Receivable, Troubled Debt Restructuring 4,000   4,000    
Loan Restructuring, Trial Modifications, Period End Amount 15,000   15,000    
Loan Restructuring, Trial Modifications, Resumed Payment, Amount     120,000    
Payment Deferral | COVID-19 | Commercial Borrower          
Financing Receivable, Impaired [Line Items]          
Loan Restructuring, Trial Modifications, Amount     455,000    
Loan Restructuring, Trial Modifications, Period End Amount 180,000   180,000    
Loan Restructuring, Trial Modifications, Resumed Payment, Amount     275,000    
Payment Deferral | COVID-19 | Hotels          
Financing Receivable, Impaired [Line Items]          
Loan Restructuring, Trial Modifications, Period End Amount $ 160,000   $ 160,000    
Residential real estate          
Financing Receivable, Impaired [Line Items]          
Threshold period past due for write-off of financing receivable 120 days   120 days   120 days
Commercial Industrial Loans And Commercial Real Estate          
Financing Receivable, Impaired [Line Items]          
Threshold period past due for write-off of financing receivable 120 days   120 days   120 days
Consumer          
Financing Receivable, Impaired [Line Items]          
Threshold period past due for write-off of financing receivable 180 days   180 days   180 days