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Note Regulatory capital requirements (Capital Requirements Basel 3) (Detail) - Basel III
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Tier 1 Common Equity to be Well Capitalized to Risk Weighted Assets         6.50%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets         8.00%
Capital Required to be Well Capitalized to Risk Weighted Assets       10.00% 10.00%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets         5.00%
Standardized approach          
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Tier 1 Common Equity to be Well Capitalized to Risk Weighted Assets       6.50%  
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets       8.00%  
Capital Required to be Well Capitalized to Risk Weighted Assets       10.00%  
Tier One Leverage Capital Required to be Well Capitalized to Average Assets       5.00%  
Common Equity Tier 1 Based Capital Minimum Requirement Ratio       4.50%  
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets       6.00%  
Capital Required for Capital Adequacy to Risk Weighted Assets       8.00%  
Minimum Capital Plus - Leverage Ratio       4.00%  
Standardized approach | Capital Adequacy Minimum Requirement Plus Capital Conservation Buffer/Basel III          
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]          
Tier 1 Common Equity to be Well Capitalized to Risk Weighted Assets 7.00% 7.00% 7.00% 6.375%  
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 8.50% 8.50% 8.50% 7.875%  
Capital Required for Capital Adequacy to Risk Weighted Assets 10.50% 10.50% 10.50% 9.875%