XML 219 R205.htm IDEA: XBRL DOCUMENT v3.22.1
Capital Management, Corporate Governance Transparency Policy and Risk Management - Summary of Bank's Internal Credit Rating Grades (Detail)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of internal credit grades [line items]    
% of Gross Carrying Amount 100.00% 100.00%
Weighted PD 100.00%  
Performing [member]    
Disclosure of internal credit grades [line items]    
% of Gross Carrying Amount 96.76% 96.17%
Weighted PD 2.05% 2.32%
High grade [member]    
Disclosure of internal credit grades [line items]    
% of Gross Carrying Amount 79.54% 76.20%
Weighted PD 1.02% 1.13%
Standard grade [member]    
Disclosure of internal credit grades [line items]    
% of Gross Carrying Amount 12.44% 12.64%
Weighted PD 5.05% 4.79%
Sub-standard grade [member]    
Disclosure of internal credit grades [line items]    
% of Gross Carrying Amount 4.78% 7.33%
Weighted PD 11.26% 12.48%
Past Due But Not Impaired [member]    
Disclosure of internal credit grades [line items]    
% of Gross Carrying Amount 2.33% 2.70%
Weighted PD 30.27% 33.24%
Impaired [Member]    
Disclosure of internal credit grades [line items]    
% of Gross Carrying Amount 0.91% 1.13%
Weighted PD 100.00% 100.00%