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Allowance for Credit Losses (Impaired Loans) (Details)
6 Months Ended
Jun. 30, 2021
USD ($)
Aug. 01, 2021
USD ($)
loan
Dec. 31, 2020
USD ($)
Loan loss allowances, impaired financing receivable      
Total troubled debt restructuring $ 3,322,000   $ 5,821,000
Amount of loans with some degree of payment deferral   $ 364,296,000  
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   4,015  
Amount of loans outstanding   $ 272,831,000  
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 Lien      
Loan loss allowances, impaired financing receivable      
Total troubled debt restructuring $ 2,234,000   4,078,000
Real estate - mortgage | Domestic | Residential Junior Lien      
Loan loss allowances, impaired financing receivable      
Total troubled debt restructuring 265,000   521,000
Consumer | Domestic      
Loan loss allowances, impaired financing receivable      
Total troubled debt restructuring 805,000   989,000
Foreign | Foreign      
Loan loss allowances, impaired financing receivable      
Total troubled debt restructuring $ 18,000   $ 233,000