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Contingencies (Tables)
 9 Months Ended
Sep. 30, 2021
Contingencies [Abstract]  
Commercial Loan Portfolio with Greater Potential Risk
Certain industries (such as hotels and restaurants) have been more adversely impacted by the COVID-19 pandemic and related periodic shutdowns of our economy.  We believe that the following industry concentrations within our commercial loan portfolio represent greater potential risk in the current economic environment.  The balances below are as of September 30, 2021.

   
Amount
    
% of
Total
Loans
  
   
(Dollars in millions)
  
Commercial and industrial portfolio segment:
            
Retail
  
$
68
      
2.4
%
Food service
    
56
      
1.9
  
Hotel
    
38
      
1.3
  
     
162
      
5.6
  
                 
Commercial real estate portfolio segment:
                
Retail
    
108
      
3.7
  
Office
    
74
      
2.6
  
Multifamily
    
67
      
2.3
  
     
249
      
8.6
  
                 
Total
  
$
411
      
14.3
%