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Allowance for Credit Losses (Impaired Loans) (Details)
9 Months Ended
Sep. 30, 2021
USD ($)
Nov. 01, 2021
USD ($)
Aug. 01, 2021
USD ($)
loan
Dec. 31, 2020
USD ($)
Loan loss allowances, impaired financing receivable        
Total troubled debt restructuring $ 2,919,000     $ 5,821,000
Amount of loans with some degree of payment deferral   $ 226,831,000    
Period of charge off for past due unsecured commercial loans 90 days      
Paycheck protection program loans (COVID-19 program)        
Loan loss allowances, impaired financing receivable        
Period of time PPP loans cover payroll and certain other costs 168 days      
Interest rate on receivable 1.00%      
Number of loans | loan     2,634  
Amount of loans outstanding     $ 169,511,000  
Paycheck protection program loans (COVID-19 program) | Loans made prior to June 5, 2020        
Loan loss allowances, impaired financing receivable        
Term of receivable (in years) 2 years      
Paycheck protection program loans (COVID-19 program) | Loans made after June 5, 2020        
Loan loss allowances, impaired financing receivable        
Term of receivable (in years) 5 years      
Real estate - mortgage | Domestic | Residential First Mortgage Financing Receivable [Member]        
Loan loss allowances, impaired financing receivable        
Total troubled debt restructuring $ 1,934,000     4,078,000
Real estate - mortgage | Domestic | Residential Junior Lien        
Loan loss allowances, impaired financing receivable        
Total troubled debt restructuring 106,000     521,000
Consumer | Domestic        
Loan loss allowances, impaired financing receivable        
Total troubled debt restructuring 862,000     989,000
Foreign. | Foreign        
Loan loss allowances, impaired financing receivable        
Total troubled debt restructuring $ 17,000     $ 233,000