XML 118 R97.htm IDEA: XBRL DOCUMENT v3.21.1
Significant accounting policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Significant Accounting Policies [line items]      
Significant Influence About Associates between 20 and 50 percent    
Useful Lives of Buildings as informed in the technical appraisal as of January 1, 2017    
Useful Lives of Furniture and facilities 10 years    
Useful Lives of Equipment 3-5 years    
Useful Lives of Automobiles 5 years    
Useful Lives of Information Systems 5 years    
CPI 36.14% 53.83% 47.65%
Defaulted Exposure [Member]      
Disclosure Of Significant Accounting Policies [line items]      
Total Risk   40.00%  
Watch List Exposure [Member]      
Disclosure Of Significant Accounting Policies [line items]      
Total Risk 20.00%    
Investment funds [member]      
Disclosure Of Significant Accounting Policies [line items]      
Economic Interest Rate 37.00%